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Consider the function below. RX ) = -4x + 8x + 5 (a) Find the critical numbers of f. (Enter your answers as a comma-separated list.) X = (b) Find the open intervals on which the function is increasing or decreasing. (Enter your answer using interval nota increasing decreasing (c) Apply the First Derivative Test to identify the relative extrema. (If an answer does not exist, enter DNE.) relative minimum (.x x ) = relative maximum (x, y) = Submit Answer 15 DETAILS LARCALC11 3.4.007. Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval F( x ) = x - 3.x concave upward concave downward Submit Answer 16 DETAILS LARCALC11 5.1.039. Find the limit (Round your answer to four decimal places.) lim In( x - 5) Submit Answer 17 DETAILS LARCALC11 5.R.011. Find the derivative of the function. F(x ) = x V In(x) F' ( x ) =