a farmer has 60m of fencing with which to construct three sides of a rectangular yard connected to an existing fence.

a. if the width of the paddock is x m and teh area inside the yard, A m^2, write down teh rule connecting A and x

b. determine teh maximum area that can be formed for the yard.

( the side of existing fence is a length)

please help me i have an exam tomorrow on this!!!