For the function below, nd a} the critical numbers; b] the open intervals where the function is increasing; and C} the open intervals where ii is decreasing. fm=2x3 +6x2 48x +15 ad: Find the critical number(s}. Select the correct answer below and, if necessary, ll in the answer box within your choice. 0 A- "he critical number(s) isiare :|. Type an integer or a simplied fraction. Use a comma to separate answers as needed.) .1, O B. "here are no critical numbers. b} List any interval(s) on which the function is increasing. Select the correct answer below and. if necessary, ll in the answer box within your choice. O A- "he function is increasing on the intervalts) . Type your answer in interval notation. Use a comma to separate answers as needed.) .1, O B. "he function is never increasing. 0} List any intervalts) on which the function is decreasing. Select the correct answer below and, if necessary, ll in the answer box within your choice. 0 A- "he Jnction is decreasing on the interval(s} |:|. Type your answer in interval notation. Use a comma to separate answers as needed.) .1, O B. "he function is never decreasing. \fDetermine the following. 4e - 0.8x dx 4e - 0.8x dx = (Type an exact answer.)