The population of mosquitoes in a certain area as a function of inches of rainfall is modeled in the table. The function is quadratic. The vertex represents that after ___ in. of rain there are ___ million mosquitoes.

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

answer: i'm great at algebra

~coco

step-by-step explanation:

the barter

the answer is ! ?