Ok so the only ones that we know for sure are 4 = 1, 6=8, 7=9 and you can’t really do all that much with 2,3,5 because it’s not as obvious
The rule of a geometric sequence:

We have:

Find 
substitute:

The answer to 9+10 is 19 because if you add 9 to the number 10, you get 19
Simple. Just add/subtract each term. 4n-2n=2n. 8m+7m=15m.
This is very basic stuff.