With a mass of 50 kg, Becky used 588 watts power to sprint up a 3.0 m high set of stairs in 2. 5 seconds. She is able to run up a 4.5 m high flight of stairs in 3.75 s.
How do you calculate power going up stairs?Work (in joules) equals your weight (in newtons) x the height of the stairs (in meters.) The power you now possess is equal to the sum of your labor times the duration of that labor, or: Work (measured in joules) divided by time equals power, measured in watts (in seconds.)
Given that mass of Becky is 50 Kg
gravity of earth is 9.8 m/s²
height of stairs is 3.0 m
time taken to run up in stairs is 2.5 s
Power = work done/ time taken
P = (50*9.8*3.0)/2.5
P = 1470/2.5
P = 588 watt
Becky is able to run up a 3.0 m high flight of stairs in 2.5 s
She is able to run up a 4.5 m high flight of stairs in t = (2.5 * 4.5)/3
t = 11.25/3
t = 3.75 s
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Which of the following sets of numbers could not represent the three sides of a triangle? [12,17,26] [12,20,29} {7,20,25} {7,16,24}
Answer:
The fourth one could not represent the three sides of a triangle
Step-by-step explanation:
because the two sides of the triangle must be larger together than the third side and 7+16=23<24, so the fourth one could not represent the three sides of a triangle.
Answer:
C
Step-by-step explanation: The third one down. There are two ways you know this.
1. If you had two boards that where 6 cm and 20 cm and tried to make a triangle with the third side = 27, the two little boards would lie flat on the 27 cm board.
2. The other three answers all make the smaller two sides larger than the third larger side.
Find the general solution of the given differential equation. (x + 1) dy + (x + 2)y = 8xe^-x y(x) = __
Give the largest interval over which the general solution is defined. (Think about the implications of any singular points. Enter your answer using interval notation.) ___
Determine whether there are any transient terms in the general solution. (Enter the transient terms as a comma-separated list; if there are none, enter NONE.)
______
The general solution of the given differential equation is y(x) = C₁e^-x + 4xe^-x. The largest interval over which the general solution is defined is (-∞, ∞). There are no transient terms in the general solution.
The differential equation given can be rearranged into the form dy/dx + (x + 2)/(x + 1)y = 8xe^-x, which is a linear first order differential equation. Using the integrating factor method, an integrating factor of e^(x + 1) can be used to obtain the general solution y(x) = C₁e^-x + 4xe^-x.
The integration constant C₁ can be determined by supplying the appropriate initial conditions. As the equation is a linear first order differential equation, the general solution is valid over the entire domain of x, which is (-∞, ∞). As the equation does not involve any terms that provide a particular value for y at any point in the domain, there are no transient terms in the general solution.
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Emily's least favorite weekly chore is mowing the lawn, even though it only takes her about 30 minutes. Her family's lawn is 1,000 square yards, but her parents are thinking about moving to the country, where they would have 5 acres of land. If the time it takes Emily to mow a lawn is proportional to its area, how many hours would it take her to mow 5 acres?
It will take Emily 12.1 hours to mow 5 acres
How determine how many hours it will take to mow 5 acres?
Variation is the relation between a set of values of one variable and a set of values of other variables
Let T and A represent the time and area respectively
Since the time it takes Emily to mow a lawn is proportional to its area. We can write:
T α A
T = kA (where k is constant of proportionality)
It takes her about 30 minutes to mow 1,000 square yards. That is:
T = 30 and A = 1,000
T = kA
30 = 1000k
k = 30/1000
k = 0.03
Time for 5 acres:
5 acres = 5 × 4840 = 24200 square yards (1 acre = 4840 square yards)
T = kA
T = 0.03 × 24200
T = 726 minutes (divide by 60 to get time in hours)
T = 12.1 hours
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When a problem is said to be decidable or undecidable give an example of an undecidable problem?
Example of an undecidable problem is given by the problems in the system created by computer viruses.
What is decidable and undecidable problems?According to the computability theory, the problems that needs either yes or no answer, but it is not possible by any computer programming languages to create exact answer then this computational problem is termed as undecidable problems.
A decidable problem is a decision problem in the computer system that can be solved by an algorithm correctly.
When is a problem said to be decidable or undecidable?
whenever we find a problem for which there is no algorithm available for solve and we are also unable to create any program that can solve the problem exactly in finite time are declared as undecidable problems.
If we find a problem that ask yes or no question about some input and there is programming language available for responding correctly then this particular problem is declared as decidable.
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What is the domain and range of the function f/x )= log x?
The domain of the function f(x) = log x is (0, ∞). The value of x belongs to (0, ∞).
What is a logarithm?
The logarithm is exponentiation's opposite function in mathematics. This indicates that the exponent to which b must be raised in order to obtain a number x is the logarithm of x to the base b.
The given function is f(x) = log x.
When the value of x is less than or equal to 0, then the value of log x is undefined.
The possible value of x where f(x) exists is the domain of a function.
In the given function the value of x must be greater than zero.
The domain of the function is (0,∞).
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Which One Doesn't Belong? Identify the linear expression that is not equivalent to the other three.
OA) (2x-1)+(-3x+7)
O B) (-5x + 3) + (4x + 3)
OC) (5x-6) + (-6x +12)
O D) (-5x-1)+(6x + 7)
The linear expression that is not equivalent to the other three is D) (-5x-1)+(6x + 7).
What is linear expression?A linear expression is an algebraic expression which is composed of constants, variables, and coefficients that are related by only addition and multiplication operations. It usually takes the form of ax + b, where 'a' and 'b' are constants and 'x' is a variable. Linear expressions can be used to describe various mathematical and physical phenomena, such as the slope of a line or the volume of a cylinder.
This linear expression is not equivalent to the other three because it does not have the same coefficient for the x terms and the constant terms. The other three expressions all have the same coefficients for the x terms and the constant terms, making them equivalent.
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Some help please!!!!
Step-by-step explanation:
what do you not understand ? please let me know where you need more instructions.
the basic rule : every term of one side has to be multiplied with every term of the other side, and the results are added (by using the correct signs of the products).
remember :
+ × + = +
- × - = +
+ × - = -
- × + = -
(3x - 3)(5x - 4) = 3x × 5x + 3x × -4 + -3 × 5x + -3 × -4 =
= 15x² - 12x - 15x + 12 = 15x² - 27x + 12
the graph represents the piecewise function
The piecewise function represented by the graph is:
f(x) = 2x when -3 ≤ x < 0
f(x) = 3 When 1/2 < x < 3/2
What is a function?A function is a relationship between inputs where each input is related to exactly one output.
Example:
f(x) = 2x + 1
f(1) = 2 + 1 = 3
f(2) = 2 x 2 + 1 = 4 + 1 = 5
The outputs of the functions are 3 and 5
The inputs of the function are 1 and 2.
We have,
Let f(x) = y = mx + c
From the graph, when -3 ≤ x < 0.
(-3, -6) and (-1, -2)
m = (-2 + 6) / (-1 + 3) = 4 / 2 = 2
(-1, -2) = (x, y)
-2 = 2 x (-1) + c
-2 = -2 + c
c = 0
f(x) = 2x
From the graph, When 1/2 < x < 3/2.
It is a horizontal line of y = 3.
f(x) = 3
Thus,
f(x) = 2x when -3 ≤ x < 0
f(x) = 3 When 1/2 < x < 3/2
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what is 20% of 14000
Answer:
2800
Step-by-step explanation:
20% of 14,000 is 2800
Multiply both sides by 14,000, then divide the left side to get the result.
Answer:
2800
is what the calculator says
Is Amu equal to Avogadro's number?
Therefore, amu (atomic mass unit) and Avogadro's number are not the same things.
Define amu (atomic mass unit).
A unit of measurement for atomic and molecular weight is the atomic mass unit (amu).
What is molecular weight?Molecular weight, commonly known as molecular mass, is the mass of a substance's molecules, calculated using the atomic weight of carbon-12, which is 12.
No, amu and Avogadro's numbers are not the same things because An atomic mass unit (amu) is a unit of measurement for atomic and molecular weight. It is defined as one twelfth of the mass of a neutral atom of carbon-12. It is commonly used in chemistry to express the masses of atoms and molecules While Avogadro's number (N) is a fundamental constant of nature that relates the number of atoms or molecules in a sample to the mass of that sample. It is defined as the number of atoms or molecules in one mole of a substance. It is approximately 6.022 x 10^23 atoms or molecules per mole.
So, amu is a unit of measurement for atomic and molecular weight, while Avogadro's number is a constant that relates the number of atoms or molecules in a sample to the mass of that sample.
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560Steve can paint his greenhouse in four hours working alone; his ten-year-old son can paint the greenhouse alone in nine hours. Working together, how long, to the nearest minute, would it take them
By working together, they can make the work done in two hours and forty-six minutes.
How do you calculate work done together?The equation below may be used to compute work: Work is equal to force times distance. The Newton metre is the SI unit of work (N m). When an item is moved across a distance of 1 m with 1 N of force, one joule is equal to the amount of work that is accomplished.Every time a force pushes anything over a distance, work is done. By multiplying the force by the distance travelled in the direction of the force, you may determine the amount of energy transferred, or work done.Therefore, the formula for work is W = F d s, which stands for work done equal to force times displacement.Given data :
Think of these work rates as "greenhouses per hour", not "hours per greenhouse". Then Steve's work rate is one fourth of a greenhouse per hour, and his son's is one ninth of a greenhouse per hour. Now, multiply each rate by the time t to get the portion of the greenhouse each paints, and add the products up to get one greenhouse. The work equation becomes:
1 / 4 t + 1 / 9 t = 1
9 / 36 . t + 4 / 36 t = 1
13 / 36 t = 1
36 / 13. 13 / 36 t = 36 / 13 .1
t = 36 / 13 hrs
or 36 / 13. 60 = 166 min
This is two hours and forty-six minutes.
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last month greg arrived late to work 3 out of 21 days his boss used this information to determine the probability of greg being late again. which pair of probabilites is correct
The probability of Greg being late again, along with the type of probability, is given as follows:
1/7, experimental probability.
How to obtain a probability?A probability is calculated as the division of the number of desired outcomes by the number of total outcomes.
In the context of this problem, the outcomes are given as follows:
Desired: Greg being late, 3 times.Total outcomes: 21 times that Greg went to work.The probability of Greg being late is then calculated as follows:
3/21 = 1/7.
Which is an experimental probability, as the number of outcomes are taken from previous "experiments".
The other type of probability is theoretical, for example, a fair coin has a 50% chance of falling heads and 50% change of falling tails.
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How do you graph the transformation of an absolute value function?
By translating, stretching and contracting, or reflecting, two functions from the same function family can become one another. Any function from a function family can be obtained by applying one or more transformations to a parent function.
By altering the graph of the parent absolute value function, many other absolute value functions can be created. The resulting absolute value functions take the following form:
[tex]y = |x-h| + k[/tex], where h and k are real numbers.
Absolute value functions can be created using the same kinds of operations that produce new linear functions. They also have a similar impact on absolute value functions. The transformations may, however, appear differently graphically due to some important discrepancies between linear functions and absolute value functions.
Here are some of the transformations:
Vertical Transformations
Translation up k units, k > 0; [tex]y = |x|+k[/tex]Translation down k units, k < 0; [tex]y = |x| + k[/tex]Horizontal Transformations
Translation to the right h units, h > 0; [tex]y = |x - h|[/tex]Translation to the left h units, h < 0; [tex]y = |x - h|[/tex]This is how we graph the transformation of an absolute value function.
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For a hypothesis test of H0: p = 0. 65 against the alternative Ha: p < 0. 65, the z test statistic is found to be -2. 35. What can be said about his finding?
The finding is significant at both α = 0.05 and α = 0.01.
What is hypothesis ?
A hypothesis (plural: hypotheses), in a scientific context, is a testable statement about the relationship between two or more variables or a proposed explanation for some observed phenomenon.
Have given ,
H0: p = 0. 65 , Ha: p < 0. 65 and the z test statistic is found to be -2. 35.
From the test statistic value, we can obtain the p value of the test ,
To determine if the claim is significant at both α = 0.05 and α = 0.01
We compare the Z statistic and Z critical values
If Z statistic < Z critical ; then we reject H0; if otherwise, we fail to reject H0
Z critical at 95% one tailed = - 1.645 (left tail)
Z critical at 95% one tailed = -2.326 (left tail)
- 2.35 < - 1.645
-2. 35 < 2.326
Since, Z statistic < Z critical;
The finding is significant at both α = 0.05 and α = 0.01.
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Tyler has a baseball bat that weighs 28 ounces. Find the weight in kilograms and in grams. (Note: 1 kilogram=35 ounces)
Answer:
1/ 0.8 kilograms
2/ 800 grams
Step-by-step explanation:
We know
1/
Baseball bat = 28 ounces
1 kilogram = 35 ounces
To find weight in kg we take
28 / 35 = 0.8 kg
2/
We know
1 kg = 1000 g
0.8 kg = 800 grams
So, the baseball bat weights 0.8kg or 800 grams
What is the coefficient of the variable in the expression 4 − 3x − 7 6 3 points?
The coefficient of the variable x in the expression 4a+3x +a is 3
Given that,
The expression is 4a+3x +a which can be simplified as 4a+3x +a
To find : The coefficient of the variable x in the expression
The coefficient of x in 4a+3x +a is 3
A number multiplied by a variable is referred to as the coefficient of a number. For instance, the x2 coefficient in the formula 6x2+99 is 6
Coefficient is the number that is beside the variable in the equation.
As we can see that the term that is in multiplication with x is 3
Hence, the coefficient of x in the equation is 3
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Use the figure to answer the following.
The solution of given triangle is 32°.
An isosceles triangle is what?Therefore, an isosceles triangle has two equal sides as well as two equal angles. The Greek words iso (same) and skelos are the source of the name (leg). An equilateral triangle is one in which all of its sides are equal, and a scalene triangle is one in which none of its sides are equal.
Given,
∠BAC=52°
since, ΔBAC is isosceles triangle hence opposite angle will be equal.
∠BAC+∠ABC+∠ACB=180°
2∠BCA=180°-52°
∠BCA=128/2
∠BCA=64°
also,
∠BCA+∠DCA=180°
∠ACD=180°-64°
∠ACD=116°
since,
ΔACD is isosceles triangle, hence opposite angle is equal
∠ACD+∠CAD∠ADC=180°
2∠CAD=180°-116°
∠CAD=64/2
∠CAD=32°
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what is the product of 69 and 5.6 x 10^5 expressed in scientific notation
[tex](69)(5.6\times 10^{5})\implies (69)(560000)\implies 3\underset{\leftarrow 7\to }{\underline{8640000}}\implies 3.864\times 10^{7}[/tex]
Which word or phrase describes the value of the function over the interval [ -6, 0]
Answer:
decreasing is the answer
A coin is tossed, a number cube is rolled, and a letter is picked from the word framer. 10. P(tails, 5, m)
Answer: The function you provided describes an experiment in which a coin is tossed, a number cube is rolled, and a letter is picked from the word "framer". The outcome of the experiment is represented by the ordered triple (tails, 5, m).
P(tails, 5, m) refers to the probability of the outcome (tails, 5, m) occurring. To find this probability, you would need to know the probability of each individual event:
The probability of getting tails is 1/2,
The probability of getting a 5 on a number cube is 1/6
and probability of getting letter "m" in the word "framer" is 1/6
So P(tails, 5, m) = (1/2) * (1/6) * (1/6) = 1/72
It is to be noted that in order for the inverse function to exist, the function must be one-to-one, meaning each y value has one unique x value, meaning the random variables in question should be independent. But in this case the events are dependent on one another.
Step-by-step explanation:
Joanne works two jobs to pay for college. She tutors for $25 per hour and also works as a receptionist for $12 per hour. Due to her class and study schedule, Joanne is only able to work up to 25 hours per week, but must earn at least $200 per week. If t represents the number of hours Joanne tutors and r represents the number of hours she works as a receptionist, which system of inequalities represents this scenario?
A. t + r >= 25
25t + 12r = 200
B. t + r <= 25
25t + 12r <= 200
C. t + r <= 25
25t + 12r >= 200
D. None of the systems shown represent this scenario.
The required system of inequality will be
t + r ≤ 25
25t + 12r ≥ 200
What is system of equations?
A set or group of equations that are solved together is referred to as a system of equations. Both algebraic and graphic solutions are possible for these equations. The intersection of two lines represents the system of equations' solution.
If 't' represents the number of hours Joanne tutors and 'r' represents the number of hours she works as a receptionist.
Then the total hours she can work = t + r
Since she can work up to 25 hours.
Thus t + r ≤ 25
If she earns $25 per hour by tuition and $ 12 per hour by working as a receptionist .
Then her total earning = $25t + 12r
Since she must earn $200.
Then 25t + 12r ≥ 200
Hence, the required system of inequality will be
t + r ≤ 25
25t + 12r ≥ 200
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What is the slope of the line that passes through the points (4, -6) and (-2, 3) Write your answer in simplest form.
[tex](\stackrel{x_1}{4}~,~\stackrel{y_1}{-6})\qquad (\stackrel{x_2}{-2}~,~\stackrel{y_2}{3}) \\\\\\ \stackrel{slope}{m}\implies \cfrac{\stackrel{\textit{\large rise}} {\stackrel{y_2}{3}-\stackrel{y1}{(-6)}}}{\underset{\textit{\large run}} {\underset{x_2}{-2}-\underset{x_1}{4}}} \implies \cfrac{3 +6}{-6} \implies \cfrac{ 9 }{ -6 } \implies - \cfrac{3 }{ 2 }[/tex]
Answer:
9/-6 or -1.5
Step-by-step explanation:
Follow the steps in the image
-Hope this Helped
Suppose that X ∼ Geom(p) and Y ∼ Geom(r) are independent. Find the probability P (X < Y )
The value of P(X<Y) could be p(1−q) / p+q−pq if X ∼ Geom(p) and Y ∼ Geom(r) are independent
What is probability ?
Probability could be defined as the ratio of number of favourable outcomes and total number of outcomes.
Given ,
X ∼ Geom(p) and Y ∼ Geom(r) are independent.
P(X<Y)=P(⋃1≤k<n,n∈N{X=k,Y=n})
=∑1≤k<n,n∈NP(X=k,Y=n)
=∑n=1∞∑k=1n−1P(X=k)P(Y=n)
=∑n=1∞∑k=1n−1p(1−p)k−1q(1−q)n−1
=pq∑n=1∞(1−q)n−11−(1−p)n−1p
=q∑n=1∞(1−q)n−1(1−(1−p)n−1)
=1−q / ∑n=1∞[(1−q)(1−p)]n−1
=1−q / 1−(1−p)(1−q)
=1−(1−p)(1−q)−q / 1−(1−p)(1−q)
=p(1−q) / p+q−pq.
Hence, The value of P(X<Y) could be p(1−q) / p+q−pq if X ∼ Geom(p) and Y ∼ Geom(r) are independent.
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Similar Figures / Proportion (Level 1)
Triangle OPQ is similar to triangle RST. Find the measure of side ST. Round your
answer to the nearest tenth.
Rounded to the nearest tenth, the measure of side ST is 8.0.
How to find measure of sides?In order to find the measure of side ST, you will need to use the concept of similarity. If two triangles are similar, then their corresponding sides are in proportion. If we let x be the measure of side ST, then we can set up a proportion using the given information:
[tex]OP/PQ = ST/RQ[/tex]
We also know that
[tex]OP/PQ = 2/3[/tex]
and
[tex]RQ = 12[/tex]
So we can substitute these values into the proportion and solve for x:
[tex](2/3) = ST/12[/tex]
[tex]ST = (2/3) * 12[/tex]
[tex]ST = 8[/tex]
Rounded to the nearest tenth, the measure of side ST is 8.0.
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2x-(x+5)=-1
Solve for x.
Answer:
x=4
Step-by-step explanation:
2x-(x+5)=-1
Solve for x
Distribute the minus sign
2x-x-5=-1
Combine like terms
x -5 = -1
Add 5 to each side
x-5+5 = -1+5
x=4
[tex]2x-(x+5)=-1[/tex]
Distribute negative sign:
[tex]2x+-1(x+5)=-1[/tex]
[tex]2x+-x+-5=-1[/tex]
Combine Like Terms:
[tex](2x+-x)+(-5)=-11[/tex]
[tex]x-5=-1[/tex]
Add 5 to both sides:
[tex]x-5+5=-1+5[/tex]
[tex]\fbox{x = 4}[/tex]
water pours into a fish tank at a rate of 3tf^3/min. how fast is the water level rising of the base pf the tank is a rectasngle pf dimensions 2x3ft
The water level is rising at a rate of 0.5tf² /min*ft². This is in cubic feet per minute per square feet, if you want to express this in terms of height, you will have to convert the units
How to find rate of water rising ?To find out how fast the water level is rising, we need to use the concept of volume flow rate. Volume flow rate is the volume of fluid that passes through a given surface per unit of time. In this case, the volume flow rate is given as 3tf^3/min.
Since the base of the tank is a rectangle with dimensions 2x3 ft, we can find the area of the base by multiplying the length and width:
2 ft * 3 ft = 6 ft^2
To find the rate of change of the water level, we need to divide the volume flow rate by the area of the base.
3tf^3/min / 6 ft^2 = 0.5tf^3/min*ft^2
So the water level is rising at a rate of 0.5tf^3/min*ft^2
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Graph the following linear function. f(x)= 5/2x+5
The graph of the linear function f(x) = 2/(x + 5) is attached.
What is the general equation of a straight line?The general equation of a straight line is -
y = mx + c
{m} - slope.
{c} - intercept along the y - axis.
Given is the linear function as -
f(x) = 5/(2x + 5)
Refer to the graph of the linear function attached. This graph represents the function f(x).
Therefore, the graph of the linear function f(x) = 2/(x + 5) is attached.
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please help kinda confused!!
The equation of the line in fully simplified intersect is y = mx + b
What is general equation of the line?The general equation of a straight line is y = mx + c, where m is the gradient, and y = c is the value where the line cuts the y-axis.The equation of a line is y = mx + c , where m is the slope of the line and c is a constant.We have the x-intercept (3,0) and y-intercept (0,3) on the graph.Slope of these line through these points will be ;m = (y2-y1) / (x2-x1)m= (3-0) / (0-3)m= 3/-3m= -1Also , we will get the value of c = 3 .The equation of line after putting the value of m and c will be ,y = -x + 3Thus, the equation of line is y = -x + 3To learn more about general equation of the line refers to:
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What is a 3 sided called?
A triangle is a polygon with 3 sides, and the sum of its interior angles is 180 degrees.
The properties of a triangle are:
A triangle has three sides, three angles, and three vertices.The sum of the length of any two sides of a triangle is greater than the length of the third side.The side opposite the largest angle of a triangle is the largest side.There are several types of triangles, including:
Equilateral triangle: This is a triangle with three sides of equal length and three angles of 60 degrees.
Isosceles triangle: This is a triangle with two sides of equal length and two angles of equal measure.
Scalene triangle: This is a triangle with three sides of different lengths and three angles of different measure.
Right triangle: This is a triangle with one 90-degree angle.
Acute triangle: This is a triangle with three angles that are all less than 90 degrees.
Obtuse triangle: This is a triangle with one angle that is greater than 90 degrees.
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Alexis sells stuffed animals. she sells a stuffed elephant for $14.95, and the sales tax is 5% of the sale price. about how much is the sales tax on the elephant?
The price of the sales tax on the elephant could be 0.75$
What is percentage ?
percentage can be defined as the product of ratio of given value and total value and hundred.
Given
he sells a stuffed elephant for $14.95,
the sales tax is 5% of the sale price .
So,
as the tax is 5% of the given value.
so we are here multiplying the given value to the 5/100
we get,
The amount of the tax could be
= 14.95*5/100
= 0.7475
≈ 0.75 (rounded)
Hence the price of the sales tax on the elephant could be 0.75$
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