Question 21689
first figure out 10 to the 9th power. Which is 10 multiplied 9 times. 
(ex. 10x10x10x10x10x10x10x10x10)

then figure out 10 to the 7th power.
(ex.10x10x10x10x10x10x10)

divide 10 to the 9th power by 10 to the 7th power,
and then you've got your answer.