7. (8 points) Circle True or False: (a) (T/F) If f is a function, then f(s + t) = f(s) + f(t) (b) (T/F) If lim f(x) exists but lim g(x) does not exist, then lim f(x)g(x) does not exist. (c) (T/F) If p is a polynomial, then lim p(x) = p(b) I- (d) (T/F) If f is continuous on [-1, 1] and f(-1) = 4 and f(1) = 3, then there exists a number r such that |r|