Respuesta :

Mistystar4881
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 [tex] 9^{9} [/tex]. 
Hope this helps!
swafim
[tex]9^{-3}9^{12}=9^{-3+12}=9^9[/tex]

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