0 0 3.13 [-15.71,3.13) U (0,3.13] + 3.13 correct correct [-15.71,3.13) U (0,3.13] incorrect Your union contains overlapping in At least one of the answers above is NOT correct. (1 point) Answer the following questions for the function = defined on the interval [-15.71,3.13]. Remember that you can enter pi for as part of your answer. a.) f(x) is concave down on the region(s) (-15pi/4, -5pi b.) A global minimum for this function occurs at 0 c.) A local maximum for this function which is not a global maximum occurs at 3.13 d.) The function is increasing on the region(s) [-15.71, 3.13)U(0, 3.13] Note: In some cases, you may need to give a comma-separated list of intervals, and intervals should be given in interval notation.