6. For each of the following, check for discontinuities and then use at least two other tests to make a rough sketch of the curve. Verify using a calculator. x - 3 12 - 21 - 15 a. y = x +5 c. g(t) = 1 - 5 5 (2 + x) (3 - 2x) b. f(x) = d. y = (x + 2)2 (x2 - 3x)