In 2012 the population of a city was 6.55 million the exponential growth rate was 3.87% per year

A)

b)  

c)

d)

Step-by-step explanation:

a) The function of exponential growth for a population has the following formula:

In this equation:

is the initial population

r is the growth rate

t is the time in years

In this problem we know that

million in the year 2012.

So the equation is:

Where  represents the year 2012

b) If  in 2012, then in 2018

The population in 2018 is:

c) To know when the population is equal to 10 million we must equal P(t) to 10 and solve for t.

d) The function is doubled when

We solve for t.

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c is correct thank you

Step-by-step explanation:

got it correct on edg.