Question

Set X consists of all integers that are prime numbers. Set Y consists of all 2-digit positive integers that are less than 70 and have a units digit of 7.

Answer 1

Answer:

abcof all integers that are primeX consists of all integers that are prime numbers. Set Y consists of all 2-digit positive integers that are less than 70 and have a units

Answer 2

Answer:

If x and y are positive integers such that the product of x and y is prime, what is the units’ digit of 7^x + 9^y?

(1) 24 < y < 32

(2) x = 1