All categories

3 years ago

Ms. Federman graded 5 papers in 40 minutes. At this rate, how many minutes will it take her to grade 30 papers?

Mathematics

1 answer:

Ksivusya [100]3 years ago

4 0

Answer:

240 minutes

Step-by-step explanation:

If it's 40 minutes for just 5 papers, we need to figure how many minutes it would take to grade just 1. So you have to divide 40 by 5 which is 8. Then 8 time 30 which is 240.

You might be interested in

A runner runs a distance of 350 metres in a time of 50 seconds. What is his average speed?

rodikova [14]

Answer:

Average speed = 7 metre per second

Step-by-step explanation:

Average speed ( v ) = distance / time

=》v = 350 / 50

=》v = 7

so, average speed = 7 m / sec

5 0

3 years ago

If a paper plane is thrown from the top of a 147-foot cliff into the water below, the height of the plane at any given time can

sasho [114]

Answer:

c. 6.5 seconds.

Step-by-step explanation:

We have been given that a a paper plane is thrown from the top of a 147-foot cliff into the water below, the height of the plane at any given time can be determined by the formula $h = -3t^2+147$ , where h is the height of the plane at t seconds.

To find the time, when plane will be at a height of exactly 20.25 feet, we will substitute $h=20.25$ in our given formula and solve for t as:

$20.25= -3t^2+147$

$-3t^2+147=20.25$

$-3t^2+147-147=20.25-147$

$-3t^2=-126.75$

$\frac{-3t^2}{-3}=\frac{-126.75}{-3}$

$t^2=42.25$

Take square root of both sides:

$t=\pm \sqrt{42.25}$

$t=\pm 6.5$

Since time cannot be negative, therefore, the plane will be at a height of exactly 20.25 feet after 6.5 seconds and option 'c' is the correct choice.

6 0

3 years ago

What is 37,493 decreased by 8,500

melisa1 [442]

Answer:

28,993

Step-by-step explanation:

Subtract 8,500 from 37,493

The answer is 28,993

Hope this helped :)

6 0

2 years ago

Read 2 more answers

In the figure, the radius of the partial circle with center A is 4 feet.

Aleksandr [31]

1)24.50 ;))))))))))
2)45.68 ;)))))))))

4 0

3 years ago

Read 2 more answers

A library has 167 trees on their property, but they are having trouble growing grass so they need to pay to have trees cut down

weeeeeb [17]

Answer:

15 years

Step-by-step explanation:

Given:

Number of trees = 167
This year limit = 4 trees
Yearly limit following years = 6 trees per year
Target number of trees = 50

Building inequality:

167 - 4 - 8x < 50
8x > 113
x > 113/8
x > 14.125

Adding current year to 14 we get 15 years as answer

6 0

3 years ago