Determine whether the statement is true or false. If it is true, explain why. If it is false, explain why or give an example that disproves the statement. (1.1) If f is a function, then f(s +t) = f(s) + f(t). (1.2) If f(s) = f(t), thens = t. (1.3) If f is a function, then f(3x) = 3f(x). (1.4) A vertical line intersects the graph of a function at most once. (1.5) If f is one-to-one, then f (3) -1 (x) = 1 f(x)