Well, what is the perimeter? Does it tell you what the perimeter is? If not, i can't help:(
Answer:
12.
Step-by-step explanation:
Average rate of change = (value of the function when x = 9 - value when x=3)
/
(9 - 3)
= f(9) - f(3) / (9-3)
= (9^2 - 3^2) / (9-3)
= 72 / 6
= 12.
Part a: 30 gallons (i think)
part b: 220