Please help me answer this questions, with detailed, easy to follow instructions/working out, im slow :'(:

A piece of wire 68cm long in length is bent into the shape of a rectangle.

a.) If x cm is the length of the rectangle and A cm^2 is the area enclosed by the rectangular shape, write down a formula which connects A and x.

b.) Sketch the graph of A against x for suitable x-values.

c.) Use your graph to determine the maximum area formed.