1. Write a function C that represent the cost of buying x facemask, if a facemask cost P65.00 C(x) = 65x 2. A commuter pays P 9.00 for a jeepney fare for the first 5 km and an additional P0.75 for every succeeding distance d in kilometer. Represent the situation as function F(d) = 9, if O5 3. If f(x) = x + 6, evaluate: a. f(4) b. f(-2) c. f(-x) Solution: a. (x) = x + 6 b. f(x) = x + 6 c. f(x) = x + 6 f(-2) = (-2) + 6 f(-x) = -x + 6 f(4) = 10 f(-2) = 4 f(4) = 4+ 6 = ​