Please tell me how to solve below questions

1) evaluate the given sum using the properties of summations

1+4+9 .... + 361 + 400

2) approximate the given definite integral by finding the sum of the requested rectangles.

(Note: The rectangles should all have equal width)

a) 032xdx with 4 rectangles using the Left Hand Rule.

(Round answer to 3 decimal places)

b)19x1dx with 5 rectangles using the Right Hand Rule