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## Homework Statement

Find the Riemann sum associated with f(x)=3 x^2 +3 ,\quad n=3 and the partition

x_0=0,\quad x_1=3,\quad x_2=4,\quad x_3=6,\qquad \mbox{ of } [0,6]

(a) when x_k^{*} is the right end-point of [x_{k-1},x_k]. .

(b) when x_k^{*} is the mid-point of [x_{k-1},x_k]

## Homework Equations

I have no idea where to begin.