3. The figure shows a rectangle with a width of 3k inches. The length of the rectangle is 5 inches longer than the width.
a.) Find the length of the rectangle in terms of k.
b.) What is the perimeter of the rectangle in terms of k?
c.) If k= 4, find the perimeter of the rectangle.

4. The figure shows a rectangle with a width of 6k inches. The length of the rectangle is 4 inches shorter than the width.

a.) Find the length of the rectangle in terms of k.

b.) What is the perimeter of the rectangle in terms of k?

c.) If k = 6, find the perimeter of the rectangle.