#7

7. Please show full supporting work for all steps of this problem. Also, please understand that this problem is asking for an APPROXIMATION using rectangular subdivisions (a Riemann Sum approach as shown in the Chapter 4.2 notes). It is not asking you to use an integral to find the actual area. Approximate the area under the graph of f(x)=0.05x4-1.44x2+60 over the interval [1,9] by dividing the interval into 4 subintervals. Use the left endpoint of each subinterval. The area under the graph of f(x)=0.05x*-1.44x2+60 over the interval [1,9] is approximately