Define the functions f(x) := x mod 10, g(x) := x + 3, and h(x) := 2x. What are the following? (That is, rewrite the definition of the given function using a single algebraic expression. For example,...

Define the functions f(x) := x mod 10, g(x) := x + 3, and h(x) := 2x. What are the following? (That is, rewrite the definition of the given function using a single algebraic expression. For example, the function g ◦ g is given by the definition (g ◦ g)(x) = g(g(x)) = x + 6.)