Hello, i am facing difficulties in answering those questions, Please help

Q1) Assume that the risk-free rate, Rf = 5%; the expected rate of return on the market, E(Rm)= 11%; and that the standard deviation of returns on the market portfolio is M =20%. Calculate the expected return and standard deviation of returns for portfolios that are 25%, 75%, and 125% invested in the market portfolio.

Q2). Suppose the return on the market is expected to be 15%, a stock has a of 0.9, and the T-bill rate is 5%. What is the expected return on the stock?