The first year Eleanor organized a fund-raising event, she invited 30 people. For each of the next 5 years, she invited double the number of people she had invited the previous year. If f n is the number of people invited to the fund-raiser n years after Eleanor began organizing the event, which of the following statements best describes the function f?
Correct answer: D. The function f is an increasing exponential function.
- A. The function f is a decreasing linear function.
- B. The function f is an increasing linear function.
- C. The function f is a decreasing exponential function.
- D. The function f is an increasing exponential function.
Explanation
Choice D is correct. It's given that the number of people Eleanor invited the first year was 30 and that the number of people invited doubles each of the following years, which is the same as increasing by a constant factor of 2. Therefore, the function f can be defined by f (n) = 30(2)n, where n is the number of years after Eleanor began organizing the event. This is an increasing exponential function.
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