Question

I just need a brief explanation of part of this solution. Thank you!

Answer 1

I understand where the (2)(2) comes from but I do not understand where the 7 comes from.

Answer 2

(2)(2) is accounting for the Area of the block that is not present.

Answer 3

7 is the centre of mass from x axis of the box you are excluding

Answer 4

Thank you! That makes a lot of sense, cant believe I didn't catch that.

Answer 5

well, that is a seriously compacted solution!!