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3 years ago

13

it takes 52 minutes for 5 people to paint 5 walls. How many minutes does it takr 20 people to paint 20 walls

2 answers:

Hoochie [10]3 years ago

8 0

Answer:

832 minutes

Step-by-step explanation:

777dan777 [17]3 years ago

5 0

Answer:

208 minutes = 3.47 hours

Step-by-step explanation:

It takes each person 10.4 minutes for 1 wall. So 20 people would take 208 minutes for 20 people to paint 20 walls

52/5 = 10.4

20 x 10.4 = 208

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Why must integration be used to find the work required to pump water out of a tank?

Anton [14]

Answer:

A. Different volumes of water are moved different distances.

Step-by-step explanation:

Integration is used to find work required to pump water out of a tank because different volumes of water are moved different distances and to sum it all we the tool required is integration. Moreover, work done is a path function or an inexact differential. It does depend upon the path followed by the process.

hence the correct answer is A.

7 0

2 years ago

Find the angle of elevation of the sun from the ground to the top of a tree when a tree that is 10 yards tall casts a shadow 14

Hitman42 [59]

Answer:

The angle of elevation of the sun from the ground to the top of a tree is $36^{\circ}$ .

Step-by-step explanation:

As given

The sun from the ground to the top of a tree when a tree that is 10 yards tall casts a shadow 14 yards long.

Now by using the trignometric identity .

$tan\theta =\frac{Perpendicular}{Base}$

As figure is given below .

AB = Perpendicular = 10 yards

BC = Base = 14 yards

Putting all the values in the trignometric identity .

$tan\theta =\frac{AB}{BC}$

$tan\theta =\frac{10}{14}$

$\theta =tan^{-1}(\frac{10}{14})$

$\theta =36^{\circ}$

Therefore the angle of elevation of the sun from the ground to the top of a tree is $36^{\circ}$ .

7 0

3 years ago

Read 2 more answers

Use a quadratic equation to find two real number that satisfy each situation, or show that no such number exist. Their sum is 4,

Black_prince [1.1K]

Answer: -25

Step-by-step explanation:

5 0

3 years ago

A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than ex

quester [9]

Answer:1866

Step-by-step explanation:

Given

n=200

x=118

Population proportion P= $\frac{118}{200}$ =0.59

$\alpha$ =0.005

Realiability =99%

$Z_{\frac{\alpha }{2}}=2.576$

Margin of erroe is given by $\sqrt{\frac{p\left ( 1-p \right )}{N}}$

0.03= $\sqrt{\frac{0.59\left ( 1-0.59 \right )}{N}}$

85.667= $\sqrt{\frac{N}{0.6519}}[tex]N=1865.88[tex]\approx 1866 Students$

4 0

2 years ago

john is 15 years old. john's mom takes him and his younger soster to a football game. tickets are $22 for adults and $16 for chi

oee [108]

Answer: 54$

Explanation:

Total cost = 16 + 16 + 22
Total cost = 32 + 22
Total cost = 54

7 0

2 years ago