Find the equivalent expression for each of the following (and explain)

Easy!

1. -1(x+5), just distribute. -1 times x and -1 times 5, when you do that, you get -1x-5!

Same thing for everything else, and if you have heard of the rainbow method, then use it but if you haven't, then it's fine. 

2. -1x+5

3. -x-3

4. -x+3

I hope I helped