Answer:
18
Step-by-step explanation:
81π=πr^2
r= 9,-9
9+9=18
Hi! So to solve for these, all you have to do is keep PEDMAS in mind. For example, for 2x^3 (Just a fancy way of writing "to the third power") first plug in 3: 2(3)^3 and take it to the third power because E (exponent) comes before M (multiplication) in PEDMAS. You should get 2(27) which then equals 54. Hope this helps:)
5.068 is the answer to the equation!
Remmember
(x^m)^n=x^(mn)
(x^-5)^n=2^-15
-5 times n=-15
divide both sides by -5
n=3
(x^-5)^3=2^-15
answe is 3
