In 30 minutes a shark can swim 4000 feet. About how fast in miles per hour does the shark swim?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).