10) -2√8 - √6 - √8 - √6
I'll start with this one.
First we separate the terms:
-2√8 - √8
-√6 - √6
If we do the operations, we get:
-3√8 which equals -3●2√2 or -6√2
-2√6
Since any further simplification will just make more terms, the final answer would be -6√2 - 2√6.
11) -√20 - √5 + 2√20 - 3√5
Same thing for this:
-√20 + 2√20 = √20 = √4√5 = 2√5
-√5 - 3√5 = -4√5
Combine them to get 2√5 - 4√5 and the final answer is -2√5.
I hope I've been some help. I took almost 3 years to get through Algebra I and then passed Algebra 2 with a 98% for the whole year. Granted, it's been long enough to slip up on some things, but if you need more help, I can try.