Answer:
I don't know
Step-by-step explanation:
You didn't give a picture to see the rectangle.
Answer:
-8
Step-by-step explanation:
All you have to do to solve this equation is plug "-3" into the equation where you see "x"

You need 12 square roots of 1764 ?
Why not find the square root of 1764 first (it's 42) and then take 12 of those ?