Q/ Let V=X+Y and U=X-Y are random variables, then the condition which make the covariance C(U,V)=0 is

Please help me with this questions. thank you!

Just solve (d,e,f,g)

Each of two parents have the genotype red/blonde, which consist of the pair of alleles that determin hair color, and each parent contributes one of thoes alleles to a child. Assume that if the child has atleast one re allele, that color will dominate and the childs hair color will be red.  List diffrent out comes, Assume these outcomes are equal likley  probability of a child of these parents will have the blonde/blonde genotype?  What is the probability that the child will have red colored hair ?

A variable X has a probability function f(x, 0) = 0e 0x; x≥0 y >0. The parameter 0 is estimated using two different estimators of simple random samples of size two: 01 2x+4x2 and 2=4x+5x2 3 3 Select the best estimator for \theta by comparing the Mean Squared Errors