Question

^^I have no idea what this is, means or is asking so help please, thanks!

Answer 1

When multiplying two expressions like this that have the same base and different exponents, just add the two exponents together. 
If you rewrite this, it is now $9^{9}$. 
Hope this helps!

Answer 2

$9^{-3}9^{12}=9^{-3+12}=9^9$