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:
y=7/10+3/10
Step-by-step explanation:
4a^5b^2=2*2*a*a*a*a*a*b*b
ab=a*b
greatest factor is ab
Answer:
~ 80.75 x 10^7
Step-by-step explanation:
9 x 8 + 9 * .5 + .5 * 8 + .5 * . 5 = ~ 80.75 x 10 ^7
Answer:
8xy that is the answer...................