Answer:

Step-by-step explanation:
Start by expanding the
into the
bracket using the distributive method:

Now, expand the result into the remaining bracket:

Answer:
7x21
Step-by-step explanation:
First, we need to find the length of the pool. Since it is three times as long as it is wide, it is 21 feet long (7 x 3 = 21). That way we can tell that it is 7x21, with a perimeter of 56 feet, and an area of 147 feet squared.
Answer:
i think is b
Step-by-step explanation:
Answer:
Step-by-step explanation:
(1) = f(x) = 4x

(2) h(x) = x + 4
y = x + 4
Replace x with y and vice versa:
x = y + 4
And then solve for 'y':
y = x - 4

(3) h(x) = x - 4
y = x - 4
x = y - 4
y = x + 4

(4) h(x) = 2x
y = 2x
x = 2y
y = 

What is this it’s so hard