please help me

Consider the function f(x) - 7(x - 4)". For this function there are two important intervals: ( - 0o, A) and ( A, oo) where A is a critical number. A is For each of the following intervals, tell whether f(x ) is increasing or decreasing. ( - 0o, A): Select an answer v (A, co): Select an answer v For each of the following intervals, tell whether f(x ) is concave up or concave down. ( - 0o, A): Select an answer v (A, co): Select an answer v