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.

A) 12.985 sq units;
B) 12.625 sq units;
C) 12.1 sq units;
D) 12.495 sq units;