Starting in 1983 the number of visitors (in thousands) to a park has decreased by 9.6 thousands people every four years. In addition, records show that in 1987 there were 83.8 thousand visitors to the park. If the current trend continues when will the number of visitors be 55.9 thousand people?

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.4: Geometric Sequences And Series
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Starting in 1983 the number of visitors (in thousands) to a park has decreased by 9.6 thousands people every four years. In addition, records show that in 1987 there were 83.8 thousand visitors to the park. If the current trend continues when will the number of visitors be 55.9 thousand people?

Expert Solution
Step 1

Given data:

  • The number of visitors to a park decreased by 9.6 thousand people every 4 years starting from 1983
  • In 1987, number of visitors to the park=83.8 thousand

Thus, number of visitors in the year 1983=83.8+9.6 thousand 

                                                                 =93.4 thousand

This is a problem of arithmetic progressions with first term, a=93.4

Common difference, d=-9.6

Last term, an=55.9

The formula for n is given by:

an=a+n-1d

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