Answer: D. 7^11
Reason:
The rule we use is 
When multiplying exponentials of the same base, we add the exponents.
The exponents 5 and 6 add to 5+6 = 11
So,

The base stays the same the entire time.
Answer:
2
+ 2
Step-by-step explanation:
= 
= 2
6. $1,470
7. $7.88
8. $11.12
9. (dont hold me on it) 4.5522581%
35=x
180-75=105
X+2x=3x
105=3x
X=35
It would be 1/3 because there are three ingredients. Therefore, if he is allergic to one of everything in each category, there are 3/10 things he is allergic to.