Please explain

Consider a bivariate vector (X, Y) with X = 0.621 + 0.822 and Y = 0.6212 0.831 Evaluate expected values of X and Y -"-= Derive variances for X and Y. Determine correlation between X and Y. Derive density of X 2 and identify it. Determine expected value of X 2 Evaluate variance of X 2. Derive density of X 2 + Y2 and identify it. Determine expected value of X 2 + Y2 Evaluate variance of X 2 + Y2