Answer:
Ok, let's suppose that the unknown amount is the number of books you buy in a library. (let's represent this unknown quantity with the variable X)
We know that each book costs $9.75, and we know that in total cost for the X books is $68.25
Then, how many books do you get?
We know that if one book costs $9.75, then X books will cost X times $9.75
Then the total cost is:
C(X) = X* $9.75
And we know that the total cost was $68.25
Then to solve this, we need to solve the equation:
X* $9.75 = $68.25
X = $68.25/$9.75 = 7
<em>Paco could buy 1/2 a yard, 5/8 yard, 3/4 yard, 7/8 yard, 1 yard, 1 1/8, so fourth since these fractions are all greater than 1. </em>
Answer:
144
Step-by-step explanation:
The equation to find c is:

So put -24 into b:

Which simplifies to:
144
So if you want to test this:
x^2 - 24x + 144
is
(x-12)^2
If the discriminant(b^2-4ac) is rational, then the quadratic is rational.
~ThePirc
The second one or the third one hope that help a little bit