PLEASE HELP ME. I really need to understand how to find which one you would subtract.
In which expression should the exponents be subtracted?

A. ( 6 to the power of 10) to the power -7
B. 2 to the power 9 and 5 to the power 9 as a fraction.
C. ( - 1/2) to the power 11 * (-1/2) to the power -4. Btw the (-1/2) is a fraction.
D. 3 to the power 8 and 3 to the power 5 as a fraction.

Question

PLEASE HELP ME. I really need to understand how to find which one you would subtract. 
In which expression should the exponents be subtracted? 

A. ( 6 to the power of 10) to the power -7
B. 2 to the power 9 and 5 to the power 9 as a fraction. 
C. ( - 1/2) to the power 11 * (-1/2) to the power -4. Btw the (-1/2) is a fraction. 
D. 3 to the power 8 and 3 to the power 5 as a fraction.

anonymous · Answer

my guess is A. just from doing this last year let me know if its correct.

anonymous · Answer

Okay. Thank you (: 
I'll let you know when I'm done.

anonymous · Answer

It was wrong.

anonymous · Answer

|dw:1346368016523:dw|Also $$a^m\times a^n=a^{m+n}$$