Please help with these 3 problems, I am confused on how to solve. Thanks!

Question 2:

An individual has $25,000 invested in a stock with a beta of 0.5 and another $75,000 invested in a stock with a beta of 1.7. If these are the only two investments in her portfolio, what is her portfolio's beta? Do not round intermediate calculations. Round your answer to two decimal places.

____%

Question 3:

eBook

Assume that the risk-free rate is 4.5% and the required return on the market is 11%. What is the required rate of return on a stock with a beta of 2? Round your answer to two decimal places.

_____ %

Question 7:

Given the following information, determine the beta coefficient for Stock L that is consistent with equilibrium: rL= 8.5%; r_RF = 1.5%; r_M = 12.5%. Round your answer to two decimal places.