![]() ![]() ![]() Summation notation (or sigma notation) allows us to write a long sum in a single expression. Yes, you can, but the objective is given in the next statement on the referenced site: My question is, equation $y = \frac5x 2$ is already given and we can use right Reimann sum and add the areas of different rectangles each of $\frac9=\frac23$ width. From Khan Academy, we want to approximate the area in the interval $$ using a right Riemann sum with $9$ equal subdivisions. ![]()
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