1. Stock A and B are positively correlated with a coefficient of 0.73. The standard deviation of return for A and B are 8.9% and 5.12%, respectively. Find the Covariance of returns between A and B.

2. The excess return of stock KYM over the risk-free rate is 3.2%, while the excess return of the S&P 500 Index over the risk-free rate is 5.0%. Find the beta of stock KYM.

3. The correlation coefficient between stock WKS and S&P 500 Index is 0.86. The standard deviation of WKS and S&P 500 are 10.2% and 6.0%, respectively. Find the beta of WKS.

4. What is the expected return of YYK with a beta of -0.6 if the Treasury yield is 3%, the expected return of S&P 500 is 7% and the credit risk premium of YYK is 0.5%.

PLEASE SHOW ALL WORK!!!! I AM TRYING TO LEARN HOW TO DO THIS, SO INCLUDE FORMULAS AND STEPS.