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rate is the  amount of something...or distance etc    divided  by TIME.....

Population density is the number of people per square km   (as your answer choices show)

8550405 people / 1213.4 km^2    = ..........

so if I had ... um, 50%  then when up by um 80% that the rate?

Volume of tank = 51 x 39 x 28  = 55962 cm^3         95%=52907.4

Volume of log = pi r^2 h = 3.14 * 5^2 * 44 = 3454 cm^3

95% of tank  +  volume of log      -   Volume of tank = spillage 

52907.4         + 3454                  -    55962               = 399.4 cm^3

steps for the rate.

so I do FV = 50 (1+6/100)^7 then what 

no, it good this is the one I what.

ok thank you

It is the definition of terms in a financial equation like     FV = PV (1+r/100)^n   

        If you have a present value (initial deposit) of $50   and and  annual interest (r) of 6 percent compounded annually for 7 years(n), it would look like this:

FV = 50 (1+6/100)^7

FV =$ 75.18       Would be your Future value after 7 years

There are SCADS of other financial equations that use these terms in various ways.....