Find an Approximation of the Area of the Region R

Multiple Choice

Find an approximation of the area of the region R under the graph of the function f on the interval [a, b]. Use n subintervals and choose the representative points as indicated. ​ ; ; ; left end points
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A) 6.985 sq units;
B) 6.495 sq units;
C) 6.1 sq units;
D) 6.625 sq units;