Question: Let f(x) = 3x + 9, X1 = 0, X2 =2, X3 = 4, X4 =6, and Ax =2. 4 (a) Find Zi ( x;

Let f(x) = 3x + 9, X1 = 0, X2 =2, X3 = 4, X4 =6, and Ax =2. 4 (a) Find Zi ( x; ) AX. i = 1 (b) The sum in part (a) approximates a definite integral using rectangles. The height of each rectangle is given by the value of the function at the left endpoint. Write the definite integral that the sum approximates

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