To find : a function rule for area of the rectangle and the area of the rectangle when its width is 2 ft.

Answer to Problem 21PPE
The function rule for the area of the
Area=
where w is width of the rectangle in feet.
Area of the rectangle when its width is 2 ft is 8 square ft.
Explanation of Solution
Given information: The length of a rectangle is 2 ft less than three times its width.
Calculation:
Let the length and width (in ft) of the rectangle be l and w respectively.
Since, length of the rectangle is 2 ft less than three times its width , so
Now, area of the rectangle is
Area=length
Area=
Area=
Thus, function rule for the area of the triangle is
Area=
where w is width of the rectangle in feet.
Now, area of the rectangle when its width is 2 ft is
Area
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