Create expressions for the length and width of the rectangle.
- length (l): x - 6
- width (w): x
Perimeter: 2l + 2w
Substitute (x - 6) for l and (x) for w.
Distribute 2 inside the parentheses.
Combine like terms.
Add 12 to both sides.
Divide both sides by 4.
Substitute 16 for x into the length and width of the rectangle.
- length: (16) - 6 = 10
- width: (16) = 16
Your answer would be A b=a+5
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explenation of the range and domain:
The domain is 0 ≤ x ≤ 5
the tank cannot have a negative storage, and the time starts at 0
for x = 0, there is 50 gallon, and on x=5, there is 0 gallon left.
so the range is from 0 to and including 50
