Consider U = {x\x is a positive integer greater than 1)
Which is an empty set?
{xx EU and is prime)
{X/X EU and 2x is prime)
{XIX EU and x can be written as a fraction)
(XIX EU and 2x can be written as a fraction)

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i