Which are true of the function f(x) = 49(1/7)^x? check all that apply. 1. the domain is the set of all real numbers. 2.the range is the set of all real numbers. 3.the domain is x > 0. 4.the range is y > 0. 4.as x increases by 1, each y-value is one-seventh of the previous y-value. 5.the initial value for the function is 7.