Question 35636
u^15/u^8 
u^15 means u*u*u*............u*u   (15 times)
u^8 means u*u*u*u.....u*u*u        (8 times)

Eight of the u's will be canceled, leaving 7 u's in the numerator.
Answer: u^15/u^8 = u^7
Cheers,
Stan H.