Year-to-date, Oracle had earned a −1.34% return. During the same time period, Valero Energy earned 7.96% and McDonald's earned 0.88%. If you have a portfolio made up of 30 percent Oracle, 25% Valero Energy, and 45 percent McDonald's, what is your portfolio return?"

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

.24

step-by-step explanation:

the probability is   .24

the first player had the highest probability of getting a silver marble

the game could be made fair by adding back the marble that was drawn after each draw