H(x)= 8 1 ​ x 3 −x 2 h, left parenthesis, x, right parenthesis, equals, start fraction, 1, divided by, 8, end fraction, x, cubed, minus, x, squared What is the average rate of change of h hh over the interval − 2 ≤ x ≤ 2 −2≤x≤2minus, 2, is less than or equal to, x, is less than or equal to, 2?