can you please write the formula and the detailed answerd

A college student owns two securities Apple and Coca-Cola Apple has an expected return of 15 percent with a standard deviation of those returns being 11 percent. Coca-Cola has an expected retum of 12 percent, and a standard deviation of 7 percent. The correlation of returns between Apple and Coca-Cola is 0.81. If the portfolio consist of $6.000 (60%) in Coca-Cola and $4,000 (406) in Apple a. What is the expected return of portfolio returns! . What is the standard deviation of your portfolio return