Question 7 Consider the function f (a) = a + 12x 3 3 points (a) Find the domain of f (a). Note: Use the letter U for union. To enter oo, type infinity with a lower case i. Domain: (-infinity, infinity) (b) Give the horizontal and vertical asymptotes of f (a), if any. Enter the equations for the asymptotes. If there is no horizontal or vertical asymptote, enter NA in the associated response area. horizontal NA asymptote: vertical NA OBP asymptote: (c) Give the intervals of increase and decrease of f (x)