Is it multiple choice? An example would be 2, 8, 32...
Answer:
x = 4
Step-by-step explanation:
4(5x - 2) = 72
Do the distributive property
20x - 8 = 72
Then add 8 to both sides to get 20x alone
20x - 8 = 72
+ 8 + 8
20x = 80
Then divide both sides by 20 to get x

x = 4
Fyi area=pir^2 not 3r2
(oh, I see, you want to aprox pi=3, ok)
radius=4
3(4^2)=area
3(16)=area
48=area
answer is 48in^2
That would be -9 should be Roth