J.
x represents the minutes and y shows how many gallons over that time.
Answer:
12x^2-4x
Step-by-step explanation:
5x + 4x^2 - 9x + 8x^2
Combine like terms
4x^2+8x^2+5x-9x
2 x 2=4
8 x 0.5= 4
0.5 x 4=2
