the population of the town is 20000 it decreases at a rate of 9% per year in about how many years will the population be fewer than 13000

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

Number nine is f(x)= 40x : ) hoped i ya