books in library6/7 are fiction, 5/7 are paperback, what fraction of books in library are fiction and paperback?

11/7

Step-by-step explanation:

Here's how we add

6

7

+

5

7

Step 1

Since our denominators match, we can add the numerators.

6 + 5 = 11

That gives us an answer of

11/7

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

the correct answer is $7.38

step-by-step explanation: