The graph of the function f in the figure below consists of line segments and a semicircle. Let g be the function given by g(a) = f(t) dt. Determine all intervals on the closed interval [-9, 9] where g is concave down. Graph of f X -10 -9 -8 - 6 -5 -4 -3 -2 1 2 3 4 5 6 7 8 9 10