A multiple-choice test contains 15 questions, each with 5 answer choices. If you randomly answer each question without leaving any blank, how many possible ways can you complete the test?

In a competition of 50 professional ballroom dancers, 22 compete in the fox-trot competition, 18 compete in the tango competition. and 6compete in both the fox-trot and tango competitions. How many dancers compete in the foxtrot or tango competitions?

If a man has 4 sweaters and 5 pairs of slacks, how many different outfit can he wear?

Pet Owners According to the Humane Society, in 2015, 65% of U.S. households owned at least one pet, and 42% of households who did own pets owned at least two. The U.S. Census Bureau tells us that there were 117 million households in 2015. How many households owned at least two pets? Report your answer in millions rounded to two places.