Find an approximation of the area of the region R under the graph of f by computing the Riemann sum of f corresponding to the partition of the interval into the subintervals shown in the accompanying figure. Use the midpoints of the subintervals as the representative points. square units 4.5 8.0 8.5 6.0 4.0 3.0 2.5 2.0 -y=f(x)

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