Yes, the gcf of even numbers would always be even because both of the numbers are divisible by 2 which makes 2 a factor of both the numbers, so the gcf should be even too.<span />
Kelsey must spend less than or equal to $65. The expression 5.50b+7.5 is correct Kelsey able to purchase 10 books. On the end Kelsey can spend $2.50 to purchase small present (calendar or book for notes)