A book store sells used books.

Paperback books cost $1.00.

Hardback books sell for $5.00.

The store sold 100 books and made $260 from the sale.

How many paperback books did the store sell?
Α. 20
В. 40
C. 60
D. 80

The correct answer is C

Positive

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1