im stuck on these questions.....
1. If X is a standard normal random variable, find
a) the p.d.f of X^3
b) the p.d.f of (X+1)^2
and......
2. If Z has a standard normal distribution then using m.g.fs show that the random variable X=2Z + 4 also has a normal distribution, and write down its mean and variance
plz help