While summation notation has many uses throughout math (and specifically calculus), we want to focus on how we can use it to write Riemann sums. 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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