Question

If there are two numbers on one side, do i have to add them together?

Answer 1

YES

Explanation:

For example, in the figure displayed in the attachment, the length of
`YM = MS + SY`

`MS = 3`

`SY = 10`

Therefore,
`YM = 3 + 10 = 13`.

The lengths of segments MS and SY sums up to give you the length of YM.