Which of the following is an example of the associative property of multiplication?

7 • (3 + 5) = 21 + 35

7 • (3 • 5) = (7 • 3) • 5

7 • (3 • 5) = 7 • (5 • 3)

7 •    = 1

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)