could you help me with 9 & 10 please

Using the following numbers for the next five questions. State of economy Recession Normal Boom Probability of state of Stock A rate of return Stock B rate of return 0.1 0.7 -15% 18 5. Expected return of A in % . I/o 17, Expected return of B in%- 2 19,8%1 6. Expected return of A in % | 8, Expected variance of B in % 304 , 09%" 12 9. Does the risk-return tradeoff hold for A and B? YES NO Why? 10. If you invest 50% of your money in A and the remaining 50% in B, what is the expected return of your investment