96+13=13+ i do not understand and i do not know the property

The expression 1.08s + 1.02b1.08s+1.02b predicts the end-of-year value of a financial portfolio where ss is the value of stocks and bb is the value of bonds in the portfolio at the beginning of the year. what is the predicted end-of-year value of a portfolio that begins the year with \$200$200 in stocks and \$100$100 in bonds?

Solve for x, y, and z. show all steps.

Joanie watched 1 out of three of a movie in the morning