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3 years ago

5

The population of a city is growing at an average rate of 3% per year in 1990 the population was 45 000.

1 answer:

Nonamiya [84]3 years ago

5 0

This is an exponential growth/decay problem...

F=Ir^t, F=final value, I=initial value, r=rate, t=time, in this case:

F=I(1.03)^t and they just want to know when F=2I so

2=1.03^t take natural log of both sides...

ln2=t*ln1.03

t=ln2/(ln1.03)

t≈23.45

So it will take approximately 23.45 years for the population to double..

1990+23.45=2013.45

So during the year of 2013 the population will have double from its 1990 level.

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3 years ago

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Val needs to find the area enclosed by the figure. The figure is made by attaching semicircles to each side of a 58 dash m-by-5

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Now, each of the semicircles has a diameter of 58m, and we have that the area of a circle is equal to:

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