Question

when m is subtracted from n, the result is r. which of the following expresses the result when 2m is added to s?
a. s+2n-2r
b. s+2n+2r
c. 2s+2n-2r
d. 2s+2n+2r
e. s-2n+2r

Answer 1

We know that
n-m = r
We need to isolate m so we can multiply it by 2. Try it.

Answer 2

Here, I'll start you off.

n -m = r
n -m +m = r +m
n = r+m

Can you get m on its own?