4 cleaner can clean all the rooms in a hotel in 7 1/2 hours. How long will it take 6 cleaners working at the same rate to clean all the rooms in the hotel?

From the given information provided, Susan's percentile rank in class is approximately 6.9%.

To find the percentile rank for Susan who is 5th in a class of 58 students, we need to use the following formula:

Percentile rank = (Number of students below Susan / Total number of students) x 100

Since Susan is the 5th student in the class, there are 4 students with higher ranks than her. Therefore, the number of students below Susan is 4.

Using the formula, we can calculate the percentile rank as:

Percentile rank = (4 / 58) x 100

Percentile rank = 6.9 (rounded to one decimal place)

Learn more about percentile here: brainly.com/question/28395856

#SPJ4

Answer:

The ring-shaped region has an inner radius of 10m and a width of 3m. To find the area of the shaded region, we need to subtract the area of the inner circle from the area of the outer circle. The area of a circle is given by A = πr^2, where r is the radius. Therefore, the area of the outer circle is A1 = π(10+3)^2 = 169π m^2 and the area of the inner circle is A2 = π(10)^2 = 100π m^2. Subtracting these two areas gives us: A1 - A2 = (169π - 100π) m^2 = 69π m^2. Therefore, the area of the shaded region is approximately 216.27 m^2 (69π ≈ 216.27) .

The probability that the speed is less than 80 kmph is 0.1587 (rounded to four decimal places).

The average speed of a car on the highway is 85 kmph with a standard deviation of 5 kmph.

Assume the speed of the car, x, is normally distributed.

The probability that the speed is less than 80 kmph is required.

We will use the Z-score formula to solve this problem.

Z-score formula:

Z = (X - μ) / σWhereX = 80 (the speed we are interested in)

μ = 85 (mean of the normal distribution)

σ = 5 (standard deviation of the normal distribution)

Z = (80 - 85) / 5 = -1

The Z-score for the speed of 80 kmph is -1.

Using the standard normal distribution table,

we find that the probability that the Z-score is less than -1 is 0.1587 (rounded to four decimal places).

For similar question on probability.

https://brainly.com/question/7965468

#SPJ11

The Probability of that Lila selects a black ribbon and Jessica selects a green ribbon = 6/35. What is Probability? Probability is possibility that deals with "occurrence of random event. It values varies from 0 to 1". According to the question,

Number of black ribbon = 3

Number of green ribbon = 12

Total number of ribbon  = 3+12 =15

Formula for Probability of an event P(E) = (Number of favorable outcomes) /(Total number of outcomes)

Probability of Lila selecting black ribbon =3/15

Jessica selects a ribbon at random from the remaining ribbons, therefore total number of ribbons is reduced to 14.

Probability of Jessica selecting Green ribbon = 12/14

The Probability of that Lila selects a black ribbon and Jessica selects a green ribbon =(3/15)(12/14)=6/35.Hence, the Probability of that Lila selects a black ribbon and Jessica selects a green ribbon is 6/35.

Diana's average speed for the entire race was approximately 0.583 meters per second.

We can start by using the formula

average speed = total distance / total time

We know that Diana ran a total distance of 700 meters, and we can find the total time by adding the time for the first lap and the time for the second lap. Let's call the distance of each lap "x"

total distance = 700 meters

distance for each lap = x meters

So, the total time is

total time = time for first lap + time for second lap

To find the time for each lap, we can use the formula

time = distance / speed

For the first lap, we have

time for first lap = x / 7

For the second lap, we have

time for second lap = x / 5

So, the total time is

total time = (x / 7) + (x / 5)

We can simplify this by finding a common denominator

total time = (5x + 7x) / (35)

total time = (12x) / 35

Now, we can substitute the values we have into the formula for average speed

average speed = total distance / total time

average speed = 700 / [(12x) / 35]

average speed = (700 × 35) / (12x)

average speed = 204.166... / x

To find the average speed for the entire race, we need to find the value of "x" that makes this expression true. We know that the two laps are equal in distance, so we can set

x + x = 700

2x = 700

x = 350

Substituting this value of "x" into the expression for average speed, we get

average speed = 204.166... / 350

average speed ≈ 0.583 meters per second

Learn more about average speed here

brainly.com/question/12322912

#SPJ4

Answer:

B. Radius

The line from the center of a circle to the edge is called a radius. The radius can be used in pi and a lot of other things

At exactly 2:00, the distance between the tips of the two hands is changing at the rate of 4 cm/min.Therefore, at exactly 2:00, the distance between the tips of the two hands is changing at the rate of [tex]2\sqrt{13}[/tex] cm/min.

The phrase "at exactly 2:00" means that at 2:00:00, the hour hand and the minute hand overlap. Both hands are together pointing upwards in the vertical direction. At this moment, the angle between the minute hand and the hour hand is 0 degrees.How do we determine the rate of change of the distance between the tips of the two hands?We start by calculating the angle between the two hands. The angle is given by:

θ(t) = 30h - 11/2m

where h is the number of hours past midnight and m is the number of minutes past the most recent hour. At exactly 2:00, h = 2 and m = 0. Thus:

θ(t) = 30(2) - 11/2(0) = 60 degrees

Next, we use the formula for the distance between two points (the tips of the two hands). Let the hour hand be at the point (0,0) and let the minute hand be at the point (x,y).

The distance between the two points is given by:

[tex]d(t) = \sqrt{(x^2 + y^2)}[/tex]

To find x and y, we use the formulas:

x(t) = r cos θ(t)y(t) = r sin θ(t)

where r is the length of each hand. At exactly 2:00:

[tex]r = 4 cmx(t) = 4 cos 60 = 2 my(t) = 4 sin 60 = 2\sqrt{(3) m}[/tex]

Therefore: [tex]d(t) = \sqrt{(x^2 + y^2)}  = \sqrt{(2 m)^2 + (2sqrt(3) m)^2)}  = 2\sqrt{(13) m}[/tex]

Finally, we differentiate with respect to time t to find the rate of change of [tex]d(t):d'(t) = 2\sqrt{13}[/tex] cm/min

for such more question on distance

https://brainly.com/question/17273444

#SPJ11

Answer: -4

Step-by-step explanation:

If homogenous equation ax^2+2hxy+by^2=0---------------(a)

represent two perpendicular lines then, a+b=0

Calculation :

Given 3x² - 8xy + my² = 0

on comparing with equation (a) we get, a=3 and b=k

given lines are mutually perpendicular then

m+3= 0

m=-3

Answer: Proper fraction

Step-by-step explanation:

A proper fraction is a fraction that has its numerator value less than the denominator.

For example, ⅔, 6/7, 8/9, etc. are proper fractions.

Answer:

circle K has greater area that circle J by 2000.18 cm sq.

Step-by-step explanation:

area of circle => π r^2

area of circle  j = 3.14 x 18 x 18 = 1017.36

area of circle K = 3.14 x 31 x 31 =3017.54

the difference in their areas : 3017.54- 1017.36  = 2000.18

The ladder reaches the height of approximately 16.03 feet up the wall. (Rounded to the nearest hundredth of a foot)

We can use trigonometry to solve this problem. Let h be the height up the wall that the ladder reaches, and let θ be the angle that the ladder makes with the ground. We know that the length of the ladder (hypotenuse) is 16 feet and the angle θ is 78 degrees.

We can use the trigonometric function tangent (tan) to find the height h:

tan(θ) = opposite/adjacent

In this case, the opposite side is the height h, the adjacent side is the distance from the ladder to the wall (which is the same as the distance from the wall to Lauren), and the angle θ is 78 degrees. So we have:

tan(78°) = h/x

where x is the distance from the ladder to the wall. Solving for h, we get:

h = x * tan(78°)

We don't know the value of x, but we can use the fact that the ladder is 16 feet long to find it. Using the Pythagorean theorem, we have:

x^2 + h^2 = 16^2

Substituting h = x * tan(78°), we get:

x^2 + (x * tan(78°))^2 = 16^2

Simplifying, we get:

x = 16 / √(1 + tan^2(78°))

x ≈ 3.83 feet

Finally, we can substitute x into our equation for h:

h = x * tan(78°)

h ≈ 16.03 feet

Therefore, the ladder reaches approximately 16.03 feet up the wall. Rounded to the nearest hundredth of a foot, the answer is 16.03 feet.

To know more about Height:

https://brainly.com/question/25961201

#SPJ4

We have shown that sin3A.cos2A - cos3A.sin2A / cos3A.cos2A + sin3A.sin2A = tanA is true for all values of A where the trigonometric functions are defined.

What is trigonometry?

The area of mathematics concerned with how triangles' sides and angles relate to one another as well as with the pertinent uses of any angle.

We can start by using trigonometric identities to simplify the left-hand side of the equation:

sin3A.cos2A - cos3A.sin2A = sin(3A + 2A) - sin(3A - 2A)

(using sum and difference formulae)

= 2 sin5A cosA

cos3A.sin2A = cos(3A - 2A) - cos(3A + 2A)

= -2 sinA cos5A

Substituting these into the original equation, we get:

(2 sin5A cosA) / (cos3A cos2A + sin3A sin2A) - (-2 sinA cos5A) / (cos3A cos2A + sin3A sin2A)

Simplifying further:

2 sin5A cosA + 2 sinA cos5A / (cos3A cos2A + sin3A sin2A)

We can use the identity tanA = sinA / cosA to write this as:

2 sinA cosA (sin4A + cos4A) / (cos3A cos2A + sin3A sin2A)

Using the identity sin2A + cos2A = 1 and rearranging, we get:

2 tanA (1 - sin2A cosA) / (cos2A + sin2A cosA)

= 2 tanA cosA / (cos2A + sin2A cosA)

= 2 sinA / (1 + cosA)

= (2 sinA / (1 + cosA)) * ((1 - cosA) / (1 - cosA))

= 2 sinA (1 - cosA) / (1 - cos^2A)

= 2 sinA (1 - cosA) / sin^2A

= 2 (1 - cosA) / sinA

= 2 sinA / sinA

= 2

Therefore, we have shown that sin3A.cos2A - cos3A.sin2A / cos3A.cos2A + sin3A.sin2A = tanA is true for all values of A where the trigonometric functions are defined.

Learn more about trigonometry on:

https://brainly.com/question/13729598

#SPJ1

Answer:

Step-by-step explanation: is 13 bc 13-8 is 5 and 5+1313is

The zeroes of the factored polynomial as required to be determined in the task content are: x = -6 and x = 8.

It follows from the task content that the zeroes of the completely factorised polynomial are to be determined.

Since the given polynomial is; x² - 2x - 48 which has been factorised completely to; (x + 6) (x - 8).

Ultimately, the zeroes of the Polynomial are as follows;

x + 6 = 0; x = -6.

and

x - 8 = 0; x = 8.

Conclusively, the zeroes of the polynomial are; x = -6 and x = 8.

Read more on zeroes of a polynomial;

https://brainly.com/question/29415775

#SPJ1

Answer:

7/20

Step-by-step explanation:

ok so it has 30 members, 7 are seniors it's possible. if there is multiple choice just let me know if it is not on there.

The school can purchase 91 adult tickets and 41 children tickets, allowing for a total of 132 teachers and students to go on the trip within the budget of $12000.

Let's start by defining some variables to represent the quantities we're interested in: Let A be the number of adult tickets purchased. Let C be the number of children tickets purchased. Let T be the total number of teachers and students who go on the trip. To maximize the number of teachers and students while staying within budget, we can use linear programming. The objective function is N = T - A - C, where N is the number of teachers and students. The inequalities are 68A + 47C ≤ 12000 and T ≤ 225. Solving this linear program, we find that the school can purchase 91 adult tickets and 41 children tickets, allowing for a total of 132 teachers and students to go on the trip within the budget of $12000.

To learn more about linear programming here:

https://brainly.com/question/30763902

#SPJ1

the complete question :

A middle school wants to take students and teachers on a field trip to Six Flags Great America for spring break. The school has a budget of spending at most $12,000. They can also only take no more than 225 teachers and students. The adult tickets cost $68 each, and children tickets cost $47 each. How many adults and children can the school take to Six Flags within the given budget and attendance limit?

a) Yes, the Cauchy-Schwarz Inequality holds for the given vectors and inner product. Since 74 ≤ 76.84, the Cauchy-Schwarz Inequality holds.

b) Yes, the triangle inequality holds for the given vectors and inner product. Since 20.25 ≤ 23.21, the triangle inequality holds.

Cauchy-Schwarz Inequality:

Using the given inner product, we have:

where ||u|| and ||v|| denote the norms of the vectors u and v, respectively.

We can calculate:

Then, applying the Cauchy-Schwarz Inequality, we have:

Triangle Inequality:

The triangle inequality states that for any vectors u, v, and w, we have:

Using the given vectors, we can calculate:

Learn more about Triangle Inequality

brainly.com/question/30298845

#SPJ11

To show that $n$ infinitely long straight lines, arranged on a plane in such a way that no two lines are parallel and no three lines intersect at a single point, divide the plane into $\frac{n^2 + n}{2}$ regions, follow these steps:

Solution:

1. Start with one straight line on the plane. This line divides the plane into two regions.
2. Add a second straight line that is not parallel to the first line and doesn't intersect at the same point. This second line will divide each of the two existing regions in half, creating two additional regions, for a total of four regions.
3. Now, add a third straight line that is not parallel to any of the existing lines and doesn't intersect at the same point as any other two lines. This line will intersect the two previous lines and divide each of the four existing regions in half, creating three additional regions for a total of seven regions.
4. Notice a pattern: with each new straight line added, the number of new regions it creates is equal to the line's order (i.e., the 1st line creates 1 new region, the 2nd line creates 2 new regions, the 3rd line creates 3 new regions, and so on).
5. To find the total number of regions for $n$ straight lines, sum the number of new regions created by each line. This is a simple arithmetic progression, so you can use the formula for the sum of an arithmetic series:

  $$\frac{n(n+1)}{2}$$

6. Thus, when $n$ infinitely long straight lines lie on a plane in such a way that no two of the lines are parallel and no three of the lines intersect at a single point, the arrangement divides the plane into $\frac{n^2 + n}{2}$ regions.

To know more about Arithmetic series:

https://brainly.com/question/16415816

#SPJ11

We can claim that after answering the above question, the  This function would simulate the car's resale value if it depreciated at a rate of 15% each year.

In mathematics, a function is a relationship between two sets of numbers in which each member of the first set (known as the domain) corresponds to a single element in the second set (called the range). In other words, a function takes inputs from one set and produces outputs from another. Inputs are commonly represented by the variable x, while outputs are represented by the variable y. A function can be described using an equation or a graph. The equation y = 2x + 1 represents a linear function in which each value of x yields a distinct value of y.

1.1) Both Kala and Remy are incorrect. The given function, [tex]p(x) = 30,000(0.68)^x[/tex], models the resale value of an automobile after x years, with a starting value of $30,000. The function's exponent x reflects the number of years since the car was purchased, and the base 0.68 is the percentage of the original value that remains after each year.

1.2) If the car's value fell by 15% per year, the function would be[tex]p(x) = 30,000(1 - 0.15)^x[/tex]. This means that the car loses 15% of its worth each year, leaving 85% of the value. This function would simulate the car's resale value if it depreciated at a rate of 15% each year.

To know more about function visit:

https://brainly.com/question/28193995

#SPJ1

1. Inverse of F=9/5C+32 is C=5/9(F-32)

2. 100 F = 37.8 C

3. 30 C = 86 F

To find the inverse of

F = 9/5C+32,

we need to solve for C. First, subtract 32 from both sides of the equation to get

F-32 = 9/5C.

Then, multiply both sides by 5/9 to isolate C, giving us

C = 5/9(F-32).

This is the inverse function.

To find the temperature in Celsius that corresponds to 100 degrees Fahrenheit, we can use the inverse function. Substituting F=100 into

C = 5/9(F-32), we get

C = 5/9(100-32) = 37.8 degrees Celsius.

To find the temperature in Fahrenheit that corresponds to 30 degrees Celsius, we can use the original equation. Substituting C=30 into

F=9/5C+32,

we get

F = 9/5(30)+32 = 86 degrees Fahrenheit.

Learn more about Inverse:

https://brainly.com/question/3831584

#SPJ4

Complete Question:

F=9/5C+32, what would be its inverse? What temperature in C corresponds to 100 F? What temperature in F corresponds to 30 C?

In the context of lean tools and approaches, one of the components of the 5s principles refers to a clean work area. The component that is being referred to here is "shine".

The 5s principles are a set of lean tools and approaches that are used to promote workplace organization, efficiency, and safety. These principles include:

Learn more about the 5s principles at

https://brainly.com/question/29898421

#SPJ11

Answer: 32

Step-by-step explanation:

Answer:

Step-by-step explanation:

2 is the base and 5 is the exponent, so we have to multiply 2 5 times.

2*2*2*2*2=32

Answer:

The total volume of the space is 55,000 cm³

Step-by-step explanation:

First, figure out the length for each of the two prisms. The prism on the right has a length of 25 cm, so we can subtract that from 50 cm (the combined length of both prisms) to get 25 cm.

Next, figure out the volume of each area. For a rectangular prism, Volume = length · width · height. The left prism's volume is 30,000 cm³ (do 25 · 60 · 20) while the right prism's volume is 25,000 cm³ (do 25 · 25 · 40).

Lastly, add the volumes together to get the total volume, which is 55,000 cm³

For the above question by using inequalities she must buy atleast 8 tickets.

What are inequalities?

Equal does not imply inequality. Typically, we use the "not equal sign ()" to indicate that two values are not equal.

So according to question

    One plan costs =$110

    Extra of $25 per ticket

 let the tickets be x, so the quation will be

                                   =>          110 + 25x ≤ 40x

                                    =>         110 ≤ 15x

                                     =>7 1/3 ≤ x

So, if she must  at least buy 8 tickets, the first plan saves money.

To know more about inequalities visit:

https://brainly.com/question/30228778

#SPJ1

The expression 24x = 55.51 -  3.19 the given condition and the number of bottle is 2.18 or 2 option D is correct

Given that,

She bought a bag of apple for $3.19 and a 24-pack of juice bottles. The total cost before tax was $55.51.

To determine the diagram could be used to represent the context if x represents how much each bottle of juice costs.

What is arithmetic?

In mathematics, it deals with numbers of operations according to the statements. There are four major arithmetic operators, addition, subtraction, multiplication, and division,

Here,

Let the cost of each juice bottle be x.

Now,

According to the question,

the expression will be

24x = 55.51 - 3.19

x= 2.18

Learn more about arithmetic here:

brainly.com/question/14753192

#SPJ1

Answer:

7 pounds

Step-by-step explanation:

3.5×8=28 pounds

35-28=7 pounds

so 7 pounds will b left

Answer:

The shape of each cut surface is a rectangle. The dimensions of each cut surface are 8 inches by 10 inches.

The area of each cut surface is 8 inches x 10 inches = 80 square inches.

Since there are two cut surfaces, the total area that Jenny needs to paint is 2 x 80 square inches = 160 square inches.

Answer: Each cut surface is a rectangle with dimensions of 8 inches by 10 inches.

The area of each cut surface is:

A = l * w

A = 8 in * 10 in

A = 80 sq in

So each cut surface has an area of 80 square inches.

To find the total area Jenny needs to paint, we need to find the combined area of both cut surfaces. Since there are two cut surfaces, we simply need to multiply the area of one cut surface by 2:

Total area = 2 * area of one cut surface

Total area = 2 * 80 sq in

Total area = 160 sq in

Therefore, Jenny needs to paint a total area of 160 square inches.

Step-by-step explanation:

Answer: We can solve the given inequality as follows:

|2x + 2| > 4

There are two cases to consider, depending on whether the expression inside the absolute value is positive or negative:

Case 1: 2x + 2 > 4

2x > 2

x > 1

Case 2: 2x + 2 < -4

2x < -6

x < -3

Therefore, the solution to the inequality is x < -3 or x > 1.

To graph the solution, we can plot the two critical points x = -3 and x = 1 on a number line, and shade the regions to the left of -3 and to the right of 1. This gives us the following graph:

<==================o-----------------o===================>

    x < -3       x > 1

The open circles indicate that the points -3 and 1 are not included in the solution, since the inequality is strict (|2x + 2| > 4).

Step-by-step explanation:

Joe is incorrect in claiming that he scored better than 80% of the people who took the test.

The 20th percentile means that Joe's score was equal to or greater than 20% of the other test takers, but lower than 80%. The percentile is not a percentage, so the statement Joe made is false.

It is important to understand that percentile rankings are not the same as percentages. Percentile rankings measure how one’s score compares to others who have taken the same test. For example, if Joe scored in the 20th percentile, it means that 20% of the other test takers had the same or lower scores. On the other hand, percentages measure a proportion of the whole. In Joe's case, 80% would mean that 80 out of 100 test takers had a higher score than Joe.

To be more accurate, Joe could have said that he scored better than 20% of the people who took the test. Percentile rankings are often used to measure an individual's performance in comparison to a larger group of peers. Although Joe might have performed well, it is important to understand the difference between percentile and percentage.

See more about percentile at: https://brainly.com/question/27903388

#SPJ11

The angle of rotation in standard form is 251.5651 degrees.

The length of arc S is approximately 20.94 feet.

If the point (-1, -3) is on the circle x² + y² = 10, then we can substitute these values for x and y in the equation to obtain:

(-1)² + (-3)² = 10

1 + 9 = 10

So, the point (-1, -3) satisfies the equation of the circle.

To find the angle of rotation in standard form, we need to use the formula:

tan(θ) = y/x

where θ is the angle of rotation.

In this case, x = -1 and y = -3, so we have:

tan(θ) = (-3)/(-1)

tan(θ) = 3

θ = tan⁻¹(3)

Using a calculator, we find:

θ ≈ 1.2490 radians or 71.5651 degrees

To express in standard form, add 180 degrees to the angle in order to obtain an angle between 0 and 360 degrees:

θ ≈ 71.5651 + 180 ≈ 251.5651 degrees

To find the length of an arc S given the radius r and the central angle θ, we use the formula:

S = (θ/360) x 2πr

In this case, r = 15 ft and θ = 1.396 radians

Substituting the values:

S = (1.396/2π) x 2π(15 ft)

S ≈ 1.396 x 15 ft

S ≈ 20.94 ft

Learn more about the length of an arc at: https://brainly.com/question/8020286

#SPJ1

Complete question:

Consider the point (-1, -3), which is on the circle x² + y² = 10. Find the angle of rotation in standard form

Find the length of the arc S when r = 15 ft and θ = 13.96°