Hello!
When finding the perimeter of a rectangle, you have to consider the properties of a rectangle. A rectangle has two pairs of equal sides where one is the width, while the other one is the length.
Now looking back at your question, it says "... a rectangle that is x units wide" ⇒ you let the width = x ; this is the same with "y units long" ⇒ length = y. Perimeter can just be : P = 24.
Therefore,
The equation would be:
x + x + y + y = P.
2x + 2y = P.
(Sub in P = 24)
∴ 2x + 2y = 24. (This should be your answer.)
:) Good luck (Message me if you have any problem)
So firstly, you want to foil - (7v^4 + 6) [Think of the minus sign as -1]: 
Next, combine like terms and your answer will be: 
Complementary angles are two angles that total 90°, so yes, you are correct.
ANSWER: The answer is (B) the sum of the measures of the two angles is 90°.
Hope this helps! :)
7ft if 3+1/3 hopefully this helps i did hwat i can
Answer: V = (1/3)a2h.
Step-by-step explanation: Square Pyramid Formulas derived in terms of side length a and height h: Volume of a square pyramid