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2 years ago

A car drives 120 miles at a speed of 40 mph. How long did it take?

Mathematics

2 answers:

maksim [4K]2 years ago

7 0

Answer:

3 hours

Step-by-step explanation:

120/40=3

ss7ja [257]2 years ago

5 0

Answer:

3 hours

Step-by-step explanation:

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Can a ratio be a rate?

puteri [66]

Yes. in math you will get to a point where you will have to use ratios to do rates they kind of the same thing.

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2 years ago

I built a storage shed in the shape of a rectangular box on a square base. The material that I used for the base cost $4 per squ

kumpel [21]

Answer:

side of 6.124 ft and height of 3.674 ft

Step-by-step explanation:

Let's s be the side of the square base and h be the height of the rectangular box.

The base and the roof would have an area of $s^2$ and cost of

$4s^2 + 2s^2 = 6s^2$

The sides would have an area of 4sh and cost of 4sh*2.5 = 10sh

So the total cost for the material is

$6s^2 + 10sh = 450$

$10sh = 450 - 6s^2$

$h = 45/s - 0.6s$

The volume of the shed has the following formula

$V = s^2h = s^2(45/s - 0.6s) = 45s - 0.6s^3$

To find the maximum value for V, we can take its first derivative, and set it to 0

$\frac{dV}{ds} = 45 - 1.2s^2 = 0$

$1.2s^2 = 45$

$s^2 = 45 / 1.2 = 37.5$

$s = \sqrt{37.5} = 6.124 ft$

h = 45/s - 0.6s = 3.674 ft

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3 years ago

I need help plssssssssssssssssssssss

NeX [460]

Answer:

Step-by-step explanation:

Given:

325 pages

90,000 words

Recommended reading: 200 words/ 1 minute

How many words on each page ?

90,000 words /325 pages ≈ 277 words / 1 page

Now see the picture.

The numbers for the difference I round them to the nearest word.

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3 years ago

Read 2 more answers

In math club, there are 15 7th graders and 25 8th graders <br> What % of the club is 7th graders

tester [92]

Answer:

37.5%

Step-by-step explanation:

15/25+15 *100%= 37.5 %

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2 years ago

PLEASE HELP!! Use complete sentences to explain how to use linear factors to determine the equation of a polynomial function.

denis-greek [22]

If x 1 and x 2 are the roots of quadratic polynomial of a x 2 + b x = c (i.e.the root of equation of a x 2 + b x + c = 0 ), then a x 2 + b x + c = a ( x − x 1 ) ( x − x 2 ) .This is the formula of factoring quadratic polynomial into factors
(Im sorry if this doesnt help)

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3 years ago