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The number of exercises on Khan academy has increased rapidly since it began in 2006.
The relationship between the elapsed time, 
t, in years, since Khan academy began, and the total number of its exercises, 
E_("year ")(t), is modeled by the following function:

E_("year ")(t)=100*(1.7)^(t)
Complete the following sentence about the monthly rate of change in the number of exercises.
Round your answer to two decimal places.
Every month, the number of exercises increases by a factor of

The number of exercises on Khan academy has increased rapidly since it began in 20062006.\newlineThe relationship between the elapsed time, t t , in years, since Khan academy began, and the total number of its exercises, Eyear (t) E_{\text {year }}(t) , is modeled by the following function:\newlineEyear (t)=100(1.7)t E_{\text {year }}(t)=100 \cdot(1.7)^{t} \newlineComplete the following sentence about the monthly rate of change in the number of exercises.\newlineRound your answer to two decimal places.\newlineEvery month, the number of exercises increases by a factor of

Full solution

Q. The number of exercises on Khan academy has increased rapidly since it began in 20062006.\newlineThe relationship between the elapsed time, t t , in years, since Khan academy began, and the total number of its exercises, Eyear (t) E_{\text {year }}(t) , is modeled by the following function:\newlineEyear (t)=100(1.7)t E_{\text {year }}(t)=100 \cdot(1.7)^{t} \newlineComplete the following sentence about the monthly rate of change in the number of exercises.\newlineRound your answer to two decimal places.\newlineEvery month, the number of exercises increases by a factor of
  1. Understand the function: Understand the given function.\newlineThe function Eyear(t)=100×(1.7)tE_{\text{year}}(t)=100\times(1.7)^{t} represents the total number of exercises EE as a function of time tt in years since Khan Academy began. The base of the exponent, 1.71.7, represents the annual growth factor.
  2. Convert to monthly growth factor: Convert the annual growth factor to a monthly growth factor.\newlineSince there are 1212 months in a year, we need to find the 1212th root of 1.71.7 to determine the monthly growth factor.\newlineMonthly growth factor = (1.7)(1/12)(1.7)^{(1/12)}
  3. Calculate monthly growth factor: Calculate the monthly growth factor.\newlineUsing a calculator, we find the 1212th root of 1.71.7.\newline(1.7)(1/12)1.04589(1.7)^{(1/12)} \approx 1.04589
  4. Round monthly growth factor: Round the monthly growth factor to two decimal places.\newlineRounded monthly growth factor 1.05\approx 1.05
  5. Complete the sentence: Complete the sentence with the calculated monthly growth factor.\newlineEvery month, the number of exercises increases by a factor of approximately 1.051.05.

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