(7y2 + 3xy - 9) - (2y2 + 3xy - 5)
5y² - 4
9y2 + 6xy - 14
5y² + 4
5y2 + 6xy - 14

step-by-step explanation:

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

part a: 1.08

part b: 27.59

333.74 ! should be your answer for this question