Question

Please answer the following Question (35 Points)

Answer 1

`2r-2s`

Explanation:

Start by removing the parentheses:

`(r-s)-(s-t)-(t-r)\\r-s-(s)-(-t)-t-(-r)`

Note that two negatives make a positive.

`r-s-s+t-t+r`

Combine like terms

`r+r-s-s+t-t\\2r-2s`