This has two parts. Here, Calculators are NOT allowed. a) St…

This has two parts. Here, Calculators are NOT allowed. a) Study the signs of the polynomial function f(x) = (4 – x)(x – 1)(x – 3) for values of x on the real lines by using a process you used in the past or, my favorite, a sign table.  b) Use part a) to sketch the graph of f(x) = (4 – x)(x – 1)(x – 3).