Need all calculations, steps and explanations, no excel solutions please

QUESTION 3: A stock has a beta of 1.14 and an expected return of 10.5 percent. A risk-free asset currently earns 2.4 percent. (a) What is the expected return on a portfolio that is equally invested in the two assets? (b) If a portfolio of the two assets has a beta of .92, what are the portfolio weights? (c) If a portfolio of the two assets has an expected return of 9 percent, what is its beta