Sunshine R.

asked • 09/19/22

The size of a rat population at the bay area of a certain city grows at a rate of 7 % monthly. If there are 260 rats currently,

The size of a rat population at the bay area of a certain city grows at a rate of 7% monthly. If there are 260 rats currently, find how many rats (rounded to the nearest whole) should be expected in 18 months. Use P(t)=260(2.7)^0.07t, and let it be 18 months.


Remember, since the rate and time are both in months, you do NOT need to convert it to another unit (i.e., years)


P(t)=   rats.

Peter R.

tutor
I don't understand your formula. It should be P(t) = 260(1.07)^18. Raise 1.07 to the 18th power and mult by 260.
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09/19/22

Brenda D.

tutor
I agree with Peter R above, what formula are you using. Rate is expressed as a decimal, where does 2.7 come from?
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09/19/22

Gabrielle M.

This is a problem I was able to find online - with different numbers - that shows that the formula is one given in the problem, not what the student had to build. Therefore, all the student would need to do, given the note about "t" in the units "months" is to plug in and simplify (or use a calculator) to find the number of rats after 18 months with a 7% monthly growth rate.
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09/19/22

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