The perimeter of a rectangle is 66 feet. Find its dimensions assuming that its length is 9 feet less than twice its width.

Length = 19 feet

Width = 14 feet

Explanation:

The perimeter, P, of a rectangle is given by

where l is the length and w is the width.

From the question, the length is 9 feet less than twice the width.

Substitute this in the equation for the perimeter.

Substitute for this in the equation for l.

Hence, the length is 19 feet and the width is 14 feet.

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).