we know that

we have

substitute the value of
in the expression above

therefore
<u>the answer is</u>

Answer:

area: 136 cm
perimeter: 48 cm
Step-by-step explanation:
For the first one just subtract

for the second one you just have to break it into smaller, more digestible pieces (work below)
Answer:
<h2><u><em>
2x + 6</em></u></h2>
Step-by-step explanation:
Simplify: (x + 3)*(+ 2)
(x + 3)*(+ 2) =
2x + 6
Answer:
because the area expression can be rewritten as
which equals 
Step-by-step explanation:
Area of the rectangle 

Since the length of a rectangle is 20 units more than its width.

The correct option is therefore 1.