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12345 [234]
3 years ago
15

How do you write an exponential equation for this problem

Mathematics
1 answer:
Serhud [2]3 years ago
6 0

Let's think about the information in the problem. The problem tells us a few key points:

  • The number of rabbits grows exponentially
  • We start with 20 rabbits (t = 0, a = 20)
  • After 6 months (t = 6), we have 100 rabbits (a = 100)

Since we know we are going to be working with an exponential model, we can start with a base exponential model:

a = P \cdot r^t

  • P is the principal, or starting amount
  • r is the growth/decay rate (in this case, growth)
  • t is the number of months
  • a is the number of rabbits

Based on the information in the problem, we can create two equations:

20 = P \cdot r^0 = P

100 = P \cdot r^6


The first equation tells us that P = 20, or that we start with 20 rabbits.  Thus, we can change the second equation to:

100 = 20 \cdot r^6

5 = r^6


Now, we don't know r, but we want to, so let's solve for it.

5 = r^6

r = \sqrt[6]{5}


Now, the problem is asking us how many rabbits we are going to have after one year (t = 12), so let's find that:

a = 20 \cdot (\sqrt[6]{5})^{12}

a = 20 \cdot (5^{\frac{1}{6}})^{12}

a = 20 \cdot 5^2

a = 500


After one year, we will have 500 rabbits.


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