From the problem :

In multiplying expressions with the same bases, the exponent will be added accordingly.
For example :

the exponent of a are m and n, and the product will be a raised to the sum of m and n.
Applying this to the problem, we have :

The answer is d. 6^-1
These words are represented as homophones as they sound alike but have the different meanings.
thats the answer just look at the picture :)
for the work
So probobillity is total sucsesses over total possible or TS/TP so
11/15 so the probobility is 11/15 or 0.73
6x-9=15
6x=24
x=4
Therefore the answer is A.
Hope this helps :)