Pls explain how to solve

Do not press Submit until all questions are colored green and you have double checked your work. The graph of f(x) is shown below on the interval [-2, 4]. - 2 0 The area bounded between the graph of f() and the x-axis on [-2, -1] is , the area bounded between the graph of f(x) and the x-axis on [-1, 3] is 32 and the area bounded between the graph of f(x) and the x-axis on [3, 4] is 3 . Determine / f(x) dx