I know I will be ridiculed mercilessly, but my little brother's having trouble with his algebra and I don't remember anything from calculus.
Could any of you geniuses tell the answer (and how to get there) for:
3/(9^x)= 243
(2^x)(2^(x+1)) = 1/16
(4^x)^(x+2) = 64
God this is humiliating.