HELP

Question:
In pic

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

Simplify. 3(4+4x) (type your answer in with no spaces)

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.