math
posted by Anonymous .
Hi I need help with 5 questions..some of it is confusing to me. I just want to make sure my answers are right.
1.6^7 x 6^4
6^3 ; 6^11 ; 6^28 ; 6^11  my answer is 6^3
2. 7/ 7^5 = 7^2 (supposed to find the missing value which is the other exponent on top of the 7 that's alone). 7; 3; 3; 7  my answer is 3
3. (2^5)______ = 2^15 (there are no answer choices) my answer is 5
4. 5^6 x 5^2/ 5^8
5^20 ; 5^12 ; 5^4 ; 5^4  My answer is 5^12
5. 8^5/ (8^7)^2 = 8 ____ (theres no answer choices, but I was really stuck on this one & I don't have a answer.)
Please Help! Thanks .

math 
Reiny
#1. correct
#2. no, you need 7^3/7^5 = 7^2 , so your choice would be the exponent +3
#3. 2^5 = 1/2^5 = 1/32
#4.
5^6 x 5^2 / 5^8
= 5^4 / 5^8 = 5^4
#5
8^5 / (8^7)^2
= 8^5 / 8^14
= 8^9
mmmh, one correct out of 5, looks like some review of multiplying and dividing powers of the same base is really necessary.
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