Hey!

I have some variance problems, that I hope you can help me solving - here we go:

"Given that var X = var Y = cov (X,Y) = 1, find

a) Var(3-X)

b) Var (2X+4)

..."

I just want to get started. I've checked all of the statistics book, that we have at college, and it really won't be solved The answer to these to problems are:

"a) 1

b) 4"

I just want to now which formula, I should use - I have look everywhere now

Thank you in advance!