Birchwood Elementrary School opened for the first year, there 240 students. During each of the following 10 years, the number of students increased exponentially. To determine the number of years (n) that had passed when the number of students when reached 365, use the following function. After how many years did the number of students reach 365?

1 answer

To determine the number of years it took for the number of students at Birchwood Elementary School to reach 365, we need to express the number of students as an exponential function. We can use the formula for exponential growth:

\[ N(t) = N_0 \cdot e^{kt} \]

where:

  • \( N(t) \) is the number of students at time \( t \)
  • \( N_0 \) is the initial number of students (240 in this case)
  • \( k \) is the growth constant
  • \( t \) is the time in years
  • \( e \) is the base of the natural logarithm (approximately equal to 2.71828)

However, without knowing the specific growth constant \( k \), we cannot directly use this formula. Instead, we can often reason and simplify it for geometric or Exponential growth by assuming the growth forms a ratio that we derive per year as a constant percentage increase.

For instance, if we assume a constant rate of growth \( r \) leading to an increase comparable through each year, the number of students could grow like this:

\[ N(t) = N_0 \cdot (1 + r)^t \]

We can set \( N(t) \) equal to 365 and solve for \( t \):

\[ 365 = 240 \cdot (1 + r)^t \]

If we assume \( t = 10 \) years before its projected finite state, we could test how much of a growth constant would achieve 365 through some geometrically identifiable means. If the growth rate is known to us or defined, we could derive how long would it actually take practically.

Beyond that, if we know the student population grows rapidly towards finite projection, common wisdom or reported rates of growth can also provide clues; for the sake of common examples assume a 5% growth rate which leads us to try:

  1. Assuming a 5% Growth Rate: 365 = 240 * 1.05^t

    Solving for t:

    \[ \frac{365}{240} = 1.05^t \] \[ 1.5208 = 1.05^t \]

    Taking the logarithm of both sides:

    \[ \log(1.5208) = t \cdot \log(1.05) \]

    Now calculate:

    \[ t = \frac{\log(1.5208)}{\log(1.05)} \approx \frac{0.1818}{0.0212} \approx 8.57 \]

It would take about 8.57 years under this assumption for the number of students to grow from 240 to 365, so practically it would take either 8 or 9 years to actually reach or surpass that number directly.

If you have specifics on the growth rate or potentially important factors in their growth (e.g., data from their first Annual Report or district growth reports), it would stipulate a clearer answer too.