The area of a square rug can be represented by the expression of 100x²+60x+9.

write an expression to represent the length of each side of the rug

100x^2+60x+9=(10x+3)^2

so length of each side is 10x+3.

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.