Approximate the area under the graph of f(x) = 0.02x" - 1.44x" + 56 over the interval [5,9] by dividing the interval into 4 subintervals. Use the left endpoint of each subinterval. The area under the graph of f(x) = 0.02x" - 1.44x + 56 over the interval [5,9] is approximately (Simplify your answer. Type an integer or a decimal.)