Exercises 4.4.56, 4.5.14, 4.5.56 were graded out of three points each. One point was given for free if you had done the other problems.
Do not expand an expression of the form (x2 + 4)2 if you can help it: it is always easier to expand than to factor back...
When drawing graphs of functions, do not forget to compute asymptotes. Also, try to make your graph reasonably large and emphasize the interesting points.