Given the function f(x) = 6x + 7, evaluate and simplify the expressions below. See special instructions on how to enter your answers.
f(a) =
f(a + h) =
f(a + h) - f(a) / h =
Instructions: Simplify answers as much as possible. Expressions such as 4(x + 2) and (x + 5)^2 should be expanded. Also collect like terms, so 3x + x should be written as 4x.