I'm trying to get an area approximation under the graph, from to by using 6 and 12 left, right, and midpoint rectangles. I've computed 6 LE and 6 & 12 for both the RE and MP rectangles but I can't figure out how to correctly do 12 rectangles for LE and MP rectangles. I already know I got the right answer for the ones I mentioned, but I can't figure out what I'm doing wrong for 12 LE and 12 MP rectangles.

for 6 rectangles, and for 12 rectangles.

I'll write out all my summations that I used my calculator for. I marked the incorrect calculations with **

6 LE is 222

**12 LE ... I got 182.875

6 RE is 474

12 RE is 402

6 MP is 330

**12 MP ... I got 225.328125