math smarties needed!
Answer:
1. [tex]y = (x + 2)(x + 3)[/tex]
2. [tex]y = -x(x + 4)[/tex]
Step-by-step explanation:
We can find the factored form of the graphed quadratic functions by:
1) Expressing each one in vertex form
2) Expanding and refactoring to rewrite in factored form
1. We know that vertex form is:
[tex]y = a(x-h)^2 + k[/tex],
where [tex]a[/tex] determines the parabola's direction and width ([tex]a=1[/tex] being the same as a standard parabola), and [tex](h,k)[/tex] is the parabola's vertex.
The vertex of this parabola is (-3, -4).
↓ plugging these values into the vertex form equation
[tex]y = 1(x - (-3))^2 + (-4)[/tex]
↓ simplifying
[tex]y = (x + 3)^2 - 4[/tex]
Now, we can expand and refactor this equation into factored form.
↓ expanding the squared term
[tex]y = (x^2 + 6x + 9) - 4[/tex]
↓ simplifying
[tex]y = x^2 + 6x + 5[/tex]
↓ factoring
[tex]\boxed{y = (x + 2)(x + 3)}[/tex]
2. We can see that the vertex is at (-2, 4).
↓ plugging into the vertex form equation
[tex]y = -1(x - (-2))^2 + 4[/tex]
Note that the parabola opens downward, so [tex]a = -1[/tex].
↓ simplifying
[tex]y = -1(x +2)^2 + 4[/tex]
↓ expanding the squared term
[tex]y = -1(x^2 +4x + 4) + 4[/tex]
↓ incorporating the outer +4 into the distribution of -1
[tex]y = -1(x^2 + 4x + 4 - 4)[/tex]
↓ simplifying
[tex]y = -1(x^2 + 4x)[/tex]
↓ factoring
[tex]y = -1(x)(x + 4)[/tex]
↓ simplifying
[tex]\boxed{y = -x(x + 4)}[/tex]
The base of an exponential function can only be a positive number.
A. True
B. Frise
Answer:
true
not good at explaining how
The base of an exponential function can only be a positive number is a true statement.
In Mathematics, the equation f(x) = [tex]a^{x}[/tex], in which the input variable x appears as an exponent, is described as an exponential function. Both the exponential function and the value of x are dependent on the exponential curve.
Here, “x” is a variable and “a” is a constant, also known as the base of the function. Depending on the exponential function, an exponential curve might increase or decrease. A quantity should have either exponential growth or exponential decay if it regularly increases or decreases by a predetermined percentage.
Therefore, the base of an exponential function can only be a positive number.
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Help please! No silly answers. Correct answers would be very much appreciated! Please try and do this as soon as possible (ASAP) Thank you all.
Answer:
y = -3x + 1
Step-by-step explanation:
y = mx + b
mx: slope
b: y-intercept
This line has a negative slope (mx) because of its direction. The plotted points are three units down and one unit right apart, which makes it -3/1x or -3x.
The y-intercept (b) is 1 because at the coordinate (0, 1) the line passes through the y-axis.
Therefore, the line should be y = -3x + 1.
The function f(x) = 1590.85)^x models the height, in feet, of a bouncing ball after x seconds.
What is the initial height of the bouncing ball?
What is the percent rate of change?
What is the height of the bouncing ball after 5 seconds? express your answers as a decimal rounded to the nearest hundredth.
In the function,
1) Initial height of the bouncing ball is 15feet.
2) The percent rate of change is -16.25%
3) The height of the bouncing ball after 5 seconds is 6.65 feet.
What is function?A mathematical phrase, rule, or law that establishes the link between an independent variable and a dependent variable (the dependent variable). In mathematics, functions exist everywhere, and they are crucial for constructing physical links in the sciences.
There seems to be a typo in the function you provided. I will assume that the function is:
=> f(x) = [tex]15(0.85)^x[/tex]
Assuming this is correct, here are the answers to your questions:
The initial height of the bouncing ball is the value of the function when
x = 0, which is:
=> [tex]f(0)=15(0.85)^0=15ft[/tex]
Therefore, the initial height of the bouncing ball is 15 feet.
The percent rate of change of the function can be found by taking the derivative of the function and expressing it as a percentage.
The derivative of the function is:
=> f'(x)= [tex]\frac{15ln(17)\times17^x-15ln(20)\times17^x}{20^x}[/tex]
The percent rate of change is then:
=> [tex]\frac{f'(x)}{f(x)} \times100\%[/tex]
=> [tex]\frac{\frac{15ln(17)\times17^x-15ln(20)\times17^x}{20^x}}{15(0.85)^x}[/tex]
=> [tex]ln(\frac{17}{20})[/tex]
=> -16.25%
Therefore, the percent rate of change of the function is approximately:
=> -16.25%
The height of the bouncing ball after 5 seconds is: then x=5
=> [tex]f(5)=15(0.85)^5[/tex]
Rounding this to the nearest hundredth, we get:
=> 6.65 feet
Therefore, the height of the bouncing ball after 5 seconds is approximately 6.65 ft.
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In 2012 there were approximately 97,507 electric vehicles sold in a particular country. In 2017, there were approximately 225,317 such vehicles sold. Answer parts a and b.
Question content area bottom
Part 1
a. Assume that the relationship between time, x, and number of electric-powered vehicles, y, is linear. Write an equation in slope-intercept form describing this relationship. Use ordered pairs of the form (years past 2012, number of vehicles).
The equation is enter your response here.
Answer: Using the two given points (0, 97507) and (5, 225317), we can find the slope:
slope = (225317 - 97507) / (5 - 0) = 25662
Then using the point-slope form of a line with the point (0, 97507):
y - 97507 = 25662x
Simplifying and putting in slope-intercept form:
y = 25662x + 97507
Therefore, the equation in slope-intercept form is y = 25662x + 97507.
Step-by-step explanation:
which of the below statements are true? i. probability is usually between 0 and 1, inclusive. ii. an event that is likely has a probability that is close to 1. iii. an event that is likely has a probability that is close to 0. iv. an event that is unlikely has a probability that is close to 1. v. an event that is unlikely has a probability that is close to 0.
The true statements are
i. probability is usually between 0 and 1, inclusive.
ii. an event that is likely has a probability that is close to 1.
(option i and ii).
Probability is an important concept in mathematics and statistics that allows us to quantify the likelihood or chance of an event occurring. It is often represented as a number between 0 and 1, inclusive. A probability of 0 means that the event is impossible, while a probability of 1 means that the event is certain to occur.
Now, let's examine each of the statements to determine which ones are true.
The first statement, "probability is usually between 0 and 1, inclusive," is true. As mentioned earlier, probability is always represented as a number between 0 and 1, inclusive.
The second statement, "an event that is likely has a probability that is close to 1," is also true. If an event is likely to occur, it means that there is a high probability of it happening. Therefore, the probability assigned to that event would be close to 1.
Hence the correct option is (a) and (b)..
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please help!!! trigonometry. WILL GIVE BRAINLY IF CORRECT
The correct trigonometric ratios for similar triangles are:
u (cos 34")/r (cos 34") = used to find u or r, given u or rt (sec 34")/q (sec 34") = used to find t or q, given t or qt (tan 34°)/q (tan 34") = used to find t or q, given t or qu (sin 34")/ r (sin 34") = used to find u or r, given u or rWhat are trigonometric ratios?Trigonometric ratios are mathematical functions that relate the angles and sides of a right triangle.
There are three main trigonometric ratios: sine, cosine, and tangent.
Sine (sin) is the ratio of the length of the side opposite an angle to the length of the hypotenuse of the triangle.
Cosine (cos) is the ratio of the length of the adjacent side to the length of the hypotenuse of the triangle.
Tangent (tan) is the ratio of the length of the opposite side to the length of the adjacent side of the triangle.
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the diagram shows a triangular face of the pyramid of cestius in rome italy. the length of the base of the triangle is 30 meters. the lengths of the other two sides of the triangle are both 36 meters.
Answer: i will be able to help if i see the question??
Step-by-step explanation:
evaluate c(4,4)
-24
-1
-6
The combination expression c(4,4) when evaluated has a solution of 1
Evaluate the combination expressionThe expression c(4,4) represents the number of ways to choose 4 items from a set of 4 items, where the order in which we choose the items does not matter.
This is also known as a combination.
We can use the formula for combinations to calculate c(4,4):
c(4,4) = 4! / (4!(4-4)!)
= 4! / (4!0!)
= 4! / 4!
= (4 x 3 x 2 x 1) / (4 x 3 x 2 x 1)
= 1
Therefore, c(4,4) = 1.
There is only one way to choose 4 items from a set of 4 items, and that is to choose all 4 items.
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What is the image point of (0, 1) after the transformation D5 o R270°?
A dramatic change in look or form is referred to as a transformation and the transformation of points (0, 1) to D5 o R270° is (270, -4).
What is transformation?A transformation is a significant alteration in appearance or form.
Your life may change as a result of a significant occasion like earning your driver's license, enrolling in college, or getting married.
A dramatic, drastic shift is called metamorphosis.
In the standard nomenclature, a function maps a number to a number, but a transform maps a function to a function.
This distinction is illogical and inaccurate.
So, fL2(R), to use an example, is a function (kind of), since f is sort of a numerical value for each xR. (x).
So, we have the points:
(0, 1)
Then, the transformation is D5 o R270°.
If D5 signifies "down 5" and R270," respectively.
then, subtract 5 from 1 and add 270 to get:
(270, -4)
Therefore, a dramatic change in look or form is referred to as a transformation and the transformation of points (0, 1) to D5 o R270° is (270, -4).
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a 10 foot ladder is leaning against a wall. if the top of the ladder slides down the wall at a rate of 2 feet per second, how fast is the bottom of the ladder moving along the ground when the bottom of the ladder is 5 feet from the wall? write your answer in the most simplified form without rounding and do not include units.
The bottom of the ladder is moving at a rate of 4 feet per second when it is 5 feet from the wall.
Let's call the distance from the bottom of the ladder to the wall "x". We can use the Pythagorean theorem to relate the distances as follows:
x^2 + 10^2 = L^2
where L is the length of the ladder, which is constant at 10 feet. We can take the derivative of both sides with respect to time t:
2x (dx/dt) = 2L (dL/dt)
We want to find (dx/dt) when x = 5 and (dL/dt) = -2 (since the top of the ladder is sliding down the wall at a rate of 2 feet per second). Plugging these values in, we get:
2(5) (dx/dt) = 2(10) (-2)
Simplifying, we get:
10 (dx/dt) = -40
Dividing both sides by 10, we get:
dx/dt = -4
Therefore, the bottom of the ladder is moving along the ground at a rate of 4 feet per second in the opposite direction.
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Use the graph to answer the question. Graph of polygon ABCD with vertices at negative 6 comma negative 2, negative 4 comma 5, 1 comma 5, negative 1 comma negative 2. A second polygon A prime B prime C prime D prime with vertices at negative 6 comma 2, negative 4 comma negative 5, 1 comma negative 5, negative 1 comma 2. Determine the line of reflection used to create the image. x = 2 y = 2 y-axis x-axis
The line of reflection used to create the image is the y-axis. The x-axis is the line of reflection utilized to produce the picture of polygon ABCD to A' B' C' D'. The y-coordinates of each vertex.
in A' B' C' D' are the inverse of the corresponding y-coordinates in ABCD, but the x-coordinates stay constant. The x-axis is a horizontal line that goes through the origin and mirrors points that cross it. As a result, when each point in ABCD is mirrored across the x-axis, the point in A' B' C' D' is produced. As a result, the transformation that maps ABCD to A' B' C' D' is an x-axis reflection. the graph to answer the question. Graph of polygon ABCD with vertices at negative 6 comma negative 2, negative 4 comma 5, 1 comma 5, negative 1 comma negative 2.
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HEEEEEEEELLLLLLLLLLPPPPPPPPP!!!!!!!!!
Answer:
The horizontal translation of the function is 3 units to the right (from the parent function). Therefore, we subtract 3 from the x-value of the function.
The equation of the graphed function in vertex form is:
[tex]\boxed{y = (x - 3)^2- 2}[/tex]
Step-by-step explanation:
The given graph shows a parabola that opens upwards.
Therefore, the equation for this function is a quadratic equation with a positive leading coefficient.
The vertex of a parabola is the minimum point of a parabola that opens upwards, or the maximum point of a parabola that opens downwards.
From inspection of the given graph, the vertex of the function is (3, -2).
The parent function of a parabola that opens upwards is y = x². This has a vertex at (0, 0).
Therefore, given the vertex of the given function is (3, -2), the parent function has been translated 3 units right and 2 units down.
For a horizontal translation to the right, we subtract the number of units from the x-value of the function.
For a vertical translation down, we subtract the number of units from the function.
Therefore, a translation of 3 units right and 2 units down from the parent function y = x² is:
[tex]\boxed{y = (x - 3)^2- 2}[/tex]
This function is written in vertex form.
To write the equation in standard form, expand the brackets and simplify:
[tex]\implies y=(x-3)(x-3)-2[/tex]
[tex]\implies y=x^2-3x-3x+9-2[/tex]
[tex]\implies y=x^2-6x+7[/tex]
[tex]\hrulefill[/tex]
Additional comments
The vertex form of a quadratic equation is y = a(x - h)² + k, where (h, k) is the vertex. Therefore, the "k" value refers to the y-value, which is the vertical translation from the parent function.
As your question refers to the "k" value for the horizontal translation, we assume that it is not referring to the k-value of the vertex form.
pls help find the unknown angles
Answer:
x=34, z=26 degrees, y=74 degrees
Step-by-step explanation:
We can find x because the triangles are equal to each other, meaning that we can set 2x-20 equal to 4x-88. When solved, x=34. This now means that the expression 2x-20 and 4x-88 both equal to 48 degrees.
Now looking at the triangle on the left, we can find the angle using supplementary angles, setting 180-154, which is 26 degrees. This means z on the triangle to the right is also 26 degrees since the triangles are equal to each other.
Because of knowing two angles, we can now find the 3rd one by adding both of them up and subtracing it from 180. That will get you 106 degrees, then using vertical angles we can find that the angle measure of 106 degrees carries over to the second triangle.
To find y now, you simply subtract 106 from 180 to get 74 degrees.
(I believe this is right, hopefully it made sense!)
Pedro says that you can use the fact 18÷6=3
to find 180÷6
.
Use the drop-down menus and enter a value to complete his explanation below.
180÷6 = 30.
Pedro says that you can use the fact 18÷6=3
to find 180÷6
.
Use the drop-down menus and enter a value to complete his explanation below.
Sure, here's the completed explanation:
If we divide 180 by 18, we get 10.
So, we can divide 180÷6 by dividing 18÷6, which is 3.
A drop-down menu is a graphical user interface control that allows users to choose from a list of options presented in a pop-up menu. When the user clicks on the menu, it expands to display a list of available options. The user can then select an option by clicking on it, which updates the menu display to show the selected option and triggers an action associated with that option.
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Lindsay is checking out books at the library, and she is primarily interested in mysteries and nonfiction. She has narrowed her selections down to eleven mysteries and six nonfiction books. If she randomly chooses three books from her selections, what's the probability that they will all be mysteries? Enter a fraction or round your answer to 4 decimal places, if necessary.
the probability that Lindsay will choose three mystery books is 0.1141 or 1141/10,000 as a fraction.
What's the probability that they will all be mysteries?Lindsay has 11 mystery books and 6 nonfiction books. The probability of Lindsay choosing one of her mystery books first is 11/17. Once she has chosen one mystery book, there are 10 remaining, so the probability of her choosing another one is 10/16.
Finally, there are 9 mystery books remaining when she chooses her third book, making the probability of her choosing one of her mystery books 9/15.
Thus, the probability that Lindsay chooses three mystery books is:P(mystery book 1 AND mystery book 2 AND mystery book 3)
= P(mystery book 1) * P(mystery book 2| mystery book 1) * P(mystery book 3| mystery book 1 and book 2)
P(mystery book 1) = 11/17P(mystery book 2| mystery book 1)
= 10/16P(mystery book 3| mystery book 1 and book 2)
= 9/15
Therefore, P(mystery book 1 AND mystery book 2 AND mystery book 3) = (11/17) * (10/16) * (9/15)
= 0.1141 (rounded to four decimal places)
Thus, the probability that Lindsay will choose three mystery books is 0.1141 or 1141/10,000 as a fraction.
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Three ballet dancers are positioned on stage. Max is 2 feet straight behind Kenji and 4 feet directly left of Lindsey. When the music begins, Max twirls to Lindsey's position, then leaps to Kenji's position, and finally walks back to his original position. How far did Max travel? If necessary, round to the nearest tenth.
The total distance Max traveled is 8.2 feet which is found by adding three distances together gives us the total distance Max traveled.
What is distance?Distance can be measured using other units such as time, speed, or even angles.
To calculate this, we need to find the distance between Max's original position and Lindsey's position, the distance between Lindsey's position and Kenji's position, and the distance between Kenji's position and Max's original position.
The distance between Max's original position and Lindsey's position=
4.0 feet.
This is because Max was 4 feet to the left of Lindsey.
The distance between Lindsey's position and Kenji's position= 2.8 feet. This is because Kenji was 2 feet behind Lindsey and Max was 4 feet left of Lindsey.
The distance between Kenji's position and Max's original position= 1.4 feet.
This is because Kenji was 2 feet behind Max.
Adding these three distances together gives us the total distance Max traveled: 4.0 feet + 2.8 feet + 1.4 feet = 8.2 feet.
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Anna has a number of tickets to sell for a play. On Monday she sells 35% of these tickets. On Tuesday she sells another 3/5 of these tickets. She then has 42 tickets left. How many did she sell on Monday?
Answer: Anna sold 56 tickets on Monday
Step-by-step explanation: Let’s call the number of tickets Anna has to sell “x”.
On Monday, Anna sells 35% of these tickets. That means she sells 0.35x tickets.
On Tuesday, she sells another 3/5 of the remaining tickets. That means she sells 0.6(0.65x) = 0.39x tickets.
After these two days of selling, Anna has 42 tickets left. So we can set up an equation:
x - 0.35x - 0.39x = 42
Simplifying this equation gives us:
0.26x = 42
Solving for x gives us:
x = 161.54
So Anna had 161 tickets to sell in total.
To find out how many tickets she sold on Monday, we can multiply the total number of tickets by the percentage she sold on Monday:
0.35 * 161 = 56.35
So Anna sold 56 tickets on Monday
suppose in an experiment, we randomly assign 15 participants to three treatment groups 1, 2, and 3 (with five participants per treatment). each of the three groups has received a different method of speed-reading instruction. a reading test is given and the number of words per minute is recorded for each participant. below is a table with the data collectedf) what is your conclusion about the population mean among the groups?
The null hypothesis for a one-way analysis of variance (ANOVA) is that there is no significant difference between the means of the groups, while the alternative hypothesis is that at least one group mean is significantly different from the others.
The null hypothesis (H0) for a one-way analysis of variance is that there is no significant difference in the mean of the dependent variable (number of words per minute) among the groups, and any observed differences are due to chance.
The alternative hypothesis (Ha) is that there is a significant difference in the mean of the dependent variable among the groups, and this difference is not due to chance. In other words, at least one of the groups has a different mean from the others.
Symbolically, the hypotheses can be expressed as:
H0: μ1 = μ2 = μ3 (where μ1, μ2, and μ3 are the population means for groups 1, 2, and 3, respectively)
Ha: At least one of the population means is different from the others.
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--The given question is incomplete, the complete question is given
" Suppose in an experiment, we randomly assign 15 participants to three treatment groups 1, 2, and 3 (with five participants per treatment). Each of the three groups has received a different method of speed-reading instruction. A reading test is given and the number of words per minute is recorded for each participant. Below is a table with the data collected:
Group 1 Group 2 Group 3
700 480 500
850 460 550
820 500 480
640 570 600
920 580 610
Write the null and alternative hypotheses for a one-way analysis of variance."--
The diagram shows a scale drawing of a rectangular playground. The scale drawing is 1:500. Work out the premiere of the real playground. Give your answer in meters
The actual playground's perimeter is 1000 (x + y) meters, where x and y are the space's length and breadth.
What is perimeter of a rectangle?One of the key formulae for the rectangle could be regarded to be its perimeter. It is the entire length of the rectangle's outside perimeter.
The perimeter of a rectangle is defined as its length times its breadth.
Dimensions of a parallelogram = 2 × (length + width)
Given that, the scale drawing is 1:500
If the scale drawing playground has a length of x and a breadth of y, then the length and width of the playground, respectively,
are 500x and 500y.
The size drawing playground's perimeter = 2 × ( Length + width )
The size drawing playground's perimeter = 2 (x + y)
The actual playground's perimeter = 2 × ( Length + width )
The actual playground's perimeter = 2 × (500x + 500y)
= 2 × 500 (x + y)
The boundaries of the area itself = 1000 (x + y)
Therefore, the actual playground's perimeter is 1000 (x + y) meters, where x and y are the playground's length and breadth.
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The complete question is attached below,
Here is a pattern of squares. The equation represents the number of small squares in the pattern of n, the step number
n²+2 is the equation that represents this pattern.
What is General intelligence?
General intelligence in mathematics refers to the ability to reason logically, solve problems, and understand abstract concepts in the field of mathematics. It is often referred to as mathematical intelligence or mathematical aptitude.
People with strong mathematical intelligence have the ability to think logically, identify patterns and relationships, and apply mathematical concepts to solve complex problems. They can quickly grasp mathematical concepts and principles, and are able to use mathematical reasoning to analyze data, make predictions, and draw conclusions.
However, it's important to note that mathematical intelligence is just one aspect of intelligence, and does not necessarily predict success in other areas of life. It is possible for someone to excel in mathematics while struggling in other areas, or vice versa.
Moreover, the concept of general intelligence itself has been a subject of debate among psychologists, with some arguing that it is a single, overarching ability, while others argue that intelligence is made up of multiple, more specific abilities.
Here we have total four patterns.
First pattern has 3 square, second has 6 squares , third has 11 squares and 18 squares.
Our first option is 3n.
If we will put n = 1,2,3,4 then we will get 3,6,9,12 respectively.
Our second option is n²+2.
If we will put n = 1,2,3,4 then we will get 3,6,11,18 respectively.
Our third option is n²+4.
If we will put n = 1,2,3,4 then we will get 5,8,13,20 respectively.
And our fourth option is 4n+3
If we will put n = 1,2,3,4 then we will get 7,11,15,19 respectively.
Therefore, second option is the correct option.
So, n²+2 is the equation that represents this pattern.
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Gwen is making a circular garden that has a diamete of 10 feet. She is looking to buy fencing for the garden. How many feet if fencing will she need?
According the given statement Gwen will need apprοximately 31.4 feet οf fencing fοr her circular garden with a diameter οf 10 feet.
What is area οf a circle?The area οf a circle is: π ( Pi) times the Radius squared: A = π r2 οr, when yοu knοw the Diameter: A = (π/4) × D2 οr, when yοu knοw the Circumference: A = C2 / 4π
The circumference οf a circle is given by the fοrmula:
C = πd
where d is the diameter οf the circle.
In this case, the diameter οf the garden is 10 feet. Substituting intο the fοrmula, we get:
C = π(10) = 10π
Therefοre, the circumference οf the garden is 10π feet.
Since fencing is placed arοund the garden, Gwen will need tο buy enοugh fencing tο cοver the circumference οf the garden, which is 10π feet.
Apprοximating π as 3.14, we can find the apprοximate length οf fencing needed as:
10π ≈ 10 x 3.14 ≈ 31.4
Therefοre, Gwen will need apprοximately 31.4 feet οf fencing fοr her circular garden with a diameter οf 10 feet.
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Use the long division method to find the result when 4x³+7x²-8x-14 is divided by 4x+7. If there is a remainder, express the result in the form q(x)+r(x)/b(x).
Answer:
a
Step-by-step explanation:
First, we write the polynomial in descending order of degree:
4x³+7x²-8x-14
Now, we start dividing the first term of the dividend by the divisor:
x²
___________
4x+7|4x³+7x²-8x-14
We multiply x² by 4x+7 to get:
x²
___________
4x+7|4x³+7x²-8x-14
4x³+7x²
-8x
Now we bring down the next term:
x²-2
___________
4x+7|4x³+7x²-8x-14
4x³+7x²
-8x-14
+8x+14
_______
0
The remainder is zero, which means that 4x+7 is a factor of 4x³+7x²-8x-14. The quotient is x²-2.
Therefore, the result when 4x³+7x²-8x-14 is divided by 4x+7 is:
4x³+7x²-8x-14 = (4x+7)(x²-2) + 0
So, the quotient is x²-2, and there is no remainder.
the average spending at neco's salad bar is $9.41 with a standard deviation of $2.81. the distribution follows t-distribution. the management is interested in the middle 90% of the customers (spending wise) as it believes that they represent their true customer base. what will be the difference between the upper and lower spending cut-offs which define the middle 90% of the customers if the sample contains 41 customers?
The average spending difference between the upper and lower spending cut-offs which define the middle 90% of the customers is $1.94.
Average spending at Neco's salad bar is $9.41
Standard deviation of the spending is $2.81
Distribution follows t-distribution,
The management is interested in the middle 90% of the customers (spending wise)Sample contains 41 customers
In order to find the cut-off values, we need to find the z-values for 5% and 95% of the data set.
Lower cut-off = Average spending - z × (Standard deviation / √n)
Upper cut-off = Average spending + z × (Standard deviation / √n)
Here,
n = 41,
Average spending = $9.41,
Standard deviation = $2.81
Let's find the value of z from the t-distribution.
t-distribution is a symmetric distribution.
Since we need to find the middle 90%, we need to find the area outside of 5% (on both sides of the distribution).
For a 90% confidence interval, the area outside of 5% on both sides of the t-distribution is [tex]\frac{0.05}{2}[/tex] = 0.025.
As per the t-distribution table, for 40 degrees of freedom, the t-value for 0.025 is 2.021..
Lower cut-off = $9.41 - 2.021 × ()
Lower cut-off = $8.44
Upper cut-off = $9.41 + 2.021 × ($2.81/√41)
Upper cut-off = $10.38
Therefore, the difference between the upper and lower spending cut-offs which define the middle 90% of the customers is
$10.38 - $8.44 = $1.94.
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of 346 cupcakes tested at tasty creme cupcake bakery , 12 are found to be defective and had no creme inside. construct the 98% confidence interval for the proportion of all cupcakes that have no creme filling.
The required proportion of cupcakes that have no creme filling with 98% confidence interval is equal to (0.012, 0.058).
Total number of cupcakes = 346
Number of defective cup cakes = 12
Confidence interval = 98%
To construct a confidence interval for the proportion of all cupcakes that have no creme filling,
Use the following formula,
CI = p ± z√((p(1-p))/n)
where,
p = proportion of defective cupcakes
n = sample size
z = z-value for the desired confidence level (98% in this case)
Plug in the values we have,
p = 12/346
= 0.0347
n = 346
z = 2.33 (from a standard normal distribution table for a 98% confidence level)
CI = 0.0347 ± 2.33√((0.0347(1-0.0347))/346)
= 0.0347 ± 0.023
So the 98% confidence interval for the proportion of all cupcakes that have no creme filling is (0.012, 0.058).
Therefore, 98% confidence interval that have true proportion of all cupcakes with no creme filling is between 0.012 and 0.058.
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Susan rolled a die 702 times. Which of the following would be a good estimate of the number of times she rolled the number 3 on the die?
Times Rolled: 702
Need estimation of: 3
Numbers on the dice: 6
702/6 = 117
Answer: 117
Question 2-1
Angle ABC is bisected by BD. If m/DBC = 36° and m/ABD = (4x-8), what is the value of x
The value of given equation is 11
What do you mean by Angle bisector ?An angle bisector is a line or ray that divides an angle into two congruent angles. In other words, it is a line or ray that cuts an angle into two equal parts. The point where the angle bisector meets the side of the angle is called the point of intersection.
In geometry, the angle bisector theorem states that if a line or ray bisects an angle of a triangle, then it divides the opposite side of the triangle into two segments that are proportional to the other two sides of the triangle. This theorem is often used to solve problems involving triangles and their side lengths.
Since BD is the angle bisector of angle ABC, we can use the angle bisector theorem to set up an equation involving the angles formed by BD and the sides of triangle ABC:
m/DBC : m/CBD = AB : AC
We know that m/DBC = 36°, so we can substitute that value into the equation:
36° : m/CBD = AB : AC
We also know that m/ABD = (4x-8), so we can substitute that value into the equation:
36° : (4x-8)° = AB : AC
To solve for x, we need to find the ratio AB : AC. Since we don't have any information about the lengths of the sides of triangle ABC, we can't find this ratio directly. However, we can use another property of angle bisectors: the angle bisector divides the opposite side of the triangle into two segments that are proportional to the other two sides.
In other words, we have:
BD/DC = AB/AC
We know that m/DBC = 36°, so we can use the fact that the angles in a triangle add up to 180° to find m/CBD:
m/CBD = 180° - m/ABC - m/DBC
m/CBD = 180° - 2m/DBC
m/CBD = 180° - 2(36°)
m/CBD = 108°
Now we can use the angle bisector theorem to write:
BD/DC = AB/AC
We know that BD = AB + AD and DC = AC + AD, so we can substitute these expressions into the equation:
(AB + AD)/AC + AD) = AB/AC
Simplifying this equation, we get:
AB/AC + AD/AC = AB/AC
Subtracting AB/AC from both sides, we get:
AD/AC = 0
Since the ratio of AD to AC is 0, we know that AD must be 0 (since we can't divide by 0). This means that D is actually on side BC, rather than on the extension of side BC. In other words, BD is actually the perpendicular bisector of side AC.
If BD is the perpendicular bisector of AC, then we know that AB = BC. Substituting this fact into our earlier equation, we get:
36° : (4x-8)° = 1 : 1
Simplifying this equation, we get:
36° = 4x-8
Adding 8 to both sides, we get:
44° = 4x
Dividing both sides by 4, we get:
11° = x
Therefore, the value of x is 11.
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calcula valor exacto de E:
E = 3 √5 + 7 π/ 5 - 2 ( √5 - 3 π)
Answer: √5 + 37π/5.
Step-by-step explanation:
To calculate the exact value of E, we can follow the order of operations (PEMDAS):
E = 3√5 + 7π/5 - 2(√5 - 3π)
E = 3√5 + 7π/5 - 2√5 + 6π (distribute the -2)
E = (3√5 - 2√5) + (7π/5 + 6π) (combine like terms)
E = √5 + 37π/5
Therefore, the exact value of E is √5 + 37π/5.
Liam estimates that the distance between City A and City B is 85 miles. The actual
distance between the two cities is 84.5 miles. What is the percent error in Liam's
estimate?
Answer:
0.5 difference
Step-by-step explanation:
since liam estimated 85 miles even though it is 84.5, you should minus 85 from 84.5 which will equal 0.5
commuting to work ~ jeremy works for a well-known marketing firm and needs to gather information about individuals in a test market for a new client. jeremy wants to calculate a 95% confidence interval for the proportion of adults in the test market who commute more than 20 miles one-way to work each day. jeremy is unable to find any preliminary information about what the proportion may be, but he wants to have a margin of error of no more than 0.04. how large a sample size will jeremy need?
Jeremy needs a sample size of at least 601 to estimate the proportion of adults in the test market who commute more than 20 miles one-way to work each day with a 95% confidence interval and a margin of error of 0.04.
To calculate the sample size required, we need to use the formula:
n = (z^2 * p * (1-p)) / E^2
where:
n = sample size
z = z-score associated with the desired confidence level (95%)
p = estimated proportion (0.5, since we have no preliminary information)
E = maximum margin of error (0.04)
Plugging in the values, we get:
n = (1.96^2 * 0.5 * (1-0.5)) / 0.04^2
n = 600.25
Rounding up to the nearest whole number, Jeremy will need a sample size of 601.
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