PLEASE HELP WITH 11 AND 12 DUE TOMORROW PLEASE ALOS EXPLAIN HOW U GOT THE ANSWER

Answer:
11. X=7
For 12, im not sure but I think it's
Step-by-step explanation:so for 11 I just divided 70 by 10 cuz to find the area of a rectangle or square you multiply the width by length. For 12 I think it's 5 because I know that you multiply the width by length then divide it in half.
Also what grade are you in?