A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a red

marble, replacing it, and then picking a blue marble?

A bag has 4 green marbles, 3 red marbles, and 3 yellow marbles. What is the probability that you pick a green marble, do not replace it, and pick a red marble?

A delicatessen offers 4 different breads, 4 cheeses, and 6 different meats. In how many ways can a sandwich be made with 1 bread, 2 cheese and 3 meats?

What is the standard deviation of the following data? If necessary, round your answer to two decimal places.

13, 11, 4, 5, 6, 9, 10, 12, 15, 16

Find the 2^ndterm of an arithmetic sequence with t₁= 4 and t₅= 6.

Triangle DEF is similar to triangle PQR. Side DE measures 3, side EF measures 7 and side FD measures 9. Side PQ measures 5x - 25 and side QR measures 6x + 4. Find the value of x.