The time length in hours of a certain airplane flight can be represented by the function f(x) = 0. 0025x 0. 75, where x is the number of miles for the flight. The time length of another airplane flight in hours can be represented by the function g(x) = 0. 004x 0. 5, where x is the number of miles for the flight. Which function represents the sum of the flight time lengths, h(x) = f(x) g(x)? h(x) = –0. 029x 0. 25 h(x) = 0. 0065x – 1. 25 h(x) = 0. 029x – 0. 25 h(x) = 0. 0065x 1. 25.