Use the required return-beta equation from the CAPM.

What is the risk-free rate if beta is 1.1, the required return 6.3% and the required return for the market portfolio is 6%?

What is beta if the risk-free rate is 2%, the required return 13% and the required return for the market is 6%? What is the required return for the market if the risk-free rate is 2%, beta 1.3 and the required return 13%?