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A store had 235 MP3 players in the month of January. Every month, 30% of the MP3 players were sold and 50 new MP3 players were stocked in the store. Which recursive function best represents the number of MP3 players in the store f(n) after n months? f(n) = 0.7 x f(n − 1) + 50, f(0) = 235, n > 0 f(n) = 237 − 0.7 x f(n − 1) + 50, f(0) = 235, n > 0 f(n) = 0.3 x f(n − 1) + 50, f(0) = 235, n > 0 f(n) = 237 + 0.7 x f(n − 1) + 50, f(0) = 235, n > 0

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pmayl
Answer is A) 
f(n) = 0.7 x f(n − 1) + 50, f(0) = 235, n > 0

This demonstrates the 30% decrease in the stock by multiplying the previous month's number by .7, and also adds 50 mp3 players each month. 
Plugging in the first month:
f(1) = .7 * 235 + 50
f(1) = 165 + 50 = 215
This is consistent with a 30% decrease in the stock, plus 50. 
joyjoyduke

Answer:

f(n) = 0.7 x f(n − 1) + 50, f(0) = 235, n > 0

Step-by-step explanation:

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