If r = 3, p = 4, and m = 2, what is g?

m^2 = ^8sqrt rp/g^2

If by "^8sqrt" you mean the 8th root, then is that

8throot(rp)/g^2
or
8throot(r)*p/g^2
or what?
or is it √8 rp/g^2?

In any case, just plug in the numbers and solve for g:

g^2 = ^8sqrt rp/m^2
I guess