Question

Need help multiplying

Answer 1

First simplify:
(r+5)(r+2). 3(r-10)
------------- × ------------
3 (r-10)(r+5)

Now you can take out the similar terms, like 3, and (r+5), and (r-10)

So the only thing left is:
(r+2). 1
------ ---
1. 1

So your answer is (r+2)/1 or just r+2 :)

Answer 2

The final answer would be:
r+2

Exact steps are shown in the attached picture.