Could somebody help me understand the process of solving these problems... Also, could someone provide a link to a site where I can practice more of these type of problems.

**1) The problem statement, all variables and given/known data:**

A rectangular package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross section) of 108". Express the volume of such a package as a function of x.

**2) ****The problem statement, all variables and given/known data:**

A Palladian window is a rectangle with a semicircle on top, as shown. Suppose the perimeter of a particular Palladian window is 28 ft. Express the total area of the window as a function of x.