(1 point) The half life of substance A is 20 years, and substance B decays at a rate of 30 % each decade. (a) Find a formula for a function f(t) that gives the amount of substance A, in milligrams, left after t years, given that the initial quantity was 100 milligrams. f(1) = help (formulas) (a) Find a formula for a function g(t) that gives the amount of substance B, in milligrams, left after t years, given that the initial quantity was 100 milligrams. g(1) = help (formulas) (c) Of which substance is there less in the long term? O A. There is less of substance A in the long term. OB. There is less of substance B in the long term. O C. There is no way to tell