The answer would be 8500m
The decimal form for 5.63 x 10^-6 is 0.00000563
You can tell that a fraction is a unit fraction when it is over a unit of one. This is also known as unit rate.
Last month, she had 100.....this month, 30 new members joined and 10 cancelled....thats basically the same as saying 20 new members joined...so there are now 120 members...at 10 per subscription = 120(10) = $ 1200 <=