I'm new to this site and i am having trouble with probability questions.

A man plants ten trees and the probability that each tree will grow is .45. What is the probability that all ten trees grow?

-is the answer just .45^10?

Also, what is the probability that at least two trees grow?

-.45^2?

If X is the random variable where the value of X is the number of trees that grow, find the mean and variance of X?

-i have no idea how to figure this out. help please. =)