The book fair had a sale where 6 books were $20.40 or 8 books were $28.00. Which is the better deal?

10 * 563.67 = 5636.7

just sum

10 + 10 = 20

i think it is c hope that

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this