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Nikolay [14]
2 years ago
6

The owner of a bookstore ordered 75 copies of a book and paid $1,350. The owner of another bookstore also ordered the same book

and paid $1,080 for 60 copies. What is the unit price, in dollars, of the book they ordered? help
Mathematics
1 answer:
kherson [118]2 years ago
4 0

Answer:

$18

Step-by-step explanation:

I did the following expressions:

1,350 / 75 = 18

1,080 / 60 = 18

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Answer:

option d. vertical opposite angle

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Which is a zero of the quadratic function f(x) = 16x?? + 32x - 9?
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Answer:

f(x) = 16x2 + 32x - 9

 

To find the "zeros", set f(x) = 0:

 

    0 = 16x2 + 32x - 9

 

The equation is solvable by factoring or by using the quadratic formula.  The factors (use the "ac" method) are:

 

    0 = (4x-1)(4x+9)

 

    x = 1/4 = 0.25 and x = -9/4 = -2.25

Step-by-step explanation:

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2 years ago
A test for marijuana usage was tried on 170 subjects who did not use marijuana. The test result was wrong 8 times.a. Based on th
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Answer:

a. 0.047

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Step-by-step explanation:

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b. As the probability for a wrong result is < 0.05 we can say that the test is unlikely to be wrong.

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3 years ago
A rectangular box has a square base. The combined length of a side of the square base, and the height is 20 in. Let x be the len
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Answer:

a. V = (20-x) x^{2} in^{3}  

b . 1185.185 in^{3}

Step-by-step explanation:

Given that:

  • The height:  20  - x (in )
  • Let x be the length of a side of the base of the box (x>0)

a. Write a polynomial function in factored form modeling the volume V of the box.

As we know that, this is a rectangular box has a square base so the Volume of it is:

V = h *x^{2} in^{3}

<=> V = (20-x) x^{2}  in^{3}

b. What is the maximum possible volume of the box?

To  maximum the volume of it, we need to use first derivative of the volume.

<=> dV / Dx = -3x^{2} + 40x

Let dV / Dx = 0, we have:

-3x^{2} + 40x  = 0

<=> x = 40/3

=>the height h = 20/3

So  the maximum possible volume of the box is:

V = 20/3 * 40/3 *40/3

= 1185.185 in^{3}

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2 years ago
At a slumber party, 1/3 of the girls painted their fingernails. Out of those girls, 1/6 of them chose red as their nail polish c
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1/18 because 1/6 of 1/3 of the girls painted their nail red and 1/6 of 1/3 is 1/6*1/3 or 1/18.
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