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4 years ago

What is the half of 15

Mathematics

2 answers:

Tatiana [17]4 years ago

4 0

Half of 15 is

15/2 = 7.5

NARA [144]4 years ago

3 0

Half means divide by 2 15/2= 7.5

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A large school district has 300 buses. if each school bus is used 3.0 hours each day, the average speed of the school buses is 1

insens350 [35]

step 1

Find the number of miles run by each bus in one day

we know that

speed=distance/time

distance=speed*time

distance=(15 mi/h)*3 h=45 miles

Find the number of miles run by the total buses in one day

Multiply by 300

300*45=13,500 miles

Find the number of miles run by the total buses in 22 days

13,500*22=297,000 miles

step 2

Find the number of gallons to run 297,000 miles

we know that

the fuel economy of the buses is 10 mi/gal

by proportion

$\frac{10}{1} \frac{miles}{gal}= \frac{297,000}{x} \frac{miles}{gal} \\ \\10*x=297,000 \\ \\x=29,700\ gal$

step 3

Find the cost of 29,700 gal of gasoline

we know that

the gasoline costs $4.10 per gallon

then

29,700*4.10=$121,770

therefore

the answer is

the cost of the gasoline is $121,770

3 0

3 years ago

0.31 repeating as a fraction

ollegr [7]

we have been asked to solve

0.31 repeating as a fraction

Let $Let \ x= 0\overline{.31}$ .......(i)

$\\ \text{equation (i) can be re-written as }\\ \\ 100x=31.31.........(ii)\\\\\text{Substract equation (i) from equation (ii) we get}\\\\100x-x=31.31-0.31\\\\99x=31\\\\\text{Divide both the sides by 99 we get}\\\\x=\frac{31}{99}$

4 0

3 years ago

Read 2 more answers

How to solve y x 6 for y = 2/3

EastWind [94]

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Answer: 4

Explanation:

2/3 x 6 = 2/3 x 6/1 = 12/3 = 4

I hope this helped!

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3 0

3 years ago

If u(x) = x^2 – x^4 + x^2 and v(x) = –x2, which expression is equivalent to (u/v)(x)?

bazaltina [42]

(u/v)(x) =

x^2 - x^4 + x^2

---------------------- = - (1 - x^2 + 1) = - (2 - x^2).

-x^2

I'd suggest you double check to ensure that you've copied down this problem correctly.

4 0

3 years ago

Degree 3 polynomial with zeros -7, 3i, and -3i

d1i1m1o1n [39]

A polynomial having degree 3 with zeros -7, 3i, and -3i is:
x³+ 7x² - 9x - 63

The correct answer is an option (A)

In this question, we need to find the polynomial whose degree is 3 polynomial and zeros are -7, 3i, and -3i

The zeros of the required polynomial = -7, 3i, and -3i

This means, the roots of the polynomial = (x + 7), (x - 3i) and (x + 3i)

We know that in complex numbers, i = √-1

So, 3i = 3√-1

= √-9

i.e., the roots of the polynomial are (x + 7), (x - √-9) and (x + √-9)

And the polynomial would be,

(x + 7)(x - √-9)(x + √-9)

= (x + 7)(x² - (√-9)²)

= (x + 7)(x² - (-9))

= (x + 7)(x² + 9)

= x³+ 7x² - 9x - 63

Therefore, a polynomial having degree 3 with zeros -7, 3i, and -3i is:
x³+ 7x² - 9x - 63

The correct answer is an option (A)

Learn more about the polynomial here:

brainly.com/question/14344049

#SPJ1

4 0

1 year ago