9^2/9^7
When you divide powers, you subtract them.
2-7= -5
Make the nine 1/9, and put the -5 with the 9. That makes it positive 5.
"D" is the correct answer.
3^2*3^5
When you multiply powers, you add them. 3 will stay a three.
2+5=7
3^7 is your answer. Or "A".
I hope this helps!
~kaikers