3 Estimate the area under the graph of f(x) = 3x between x = 0 and...

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3 Estimate the area under the graph of f(x) = 3x between x = 0 and x = 2 using each finite approximation below. a. A lower sum with two rectangles of equal width b. A lower sum with four rectangles of equal width c. An upper sum with two rectangles of equal width d. An upper sum with four rectangles of equal width a. The estimated area using a lower sum with two rectangles of equal width is (Type an integer or a decimal. Simplify your answer.) square units. 3 Estimate the area under the graph of f(x) = 3x between x = 0 and x = 2 using each finite approximation below. a. A lower sum with two rectangles of equal width b. A lower sum with four rectangles of equal width c. An upper sum with two rectangles of equal width d. An upper sum with four rectangles of equal width a. The estimated area using a lower sum with two rectangles of equal width is (Type an integer or a decimal. Simplify your answer.) square units.