Identify the terms of the expression 9a+4b-18

How do i do this activity, is appreciated

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site