Homework Help: Math- Pre calculus

Posted by Darren on Tuesday, November 1, 2011 at 1:34am.

A community bird-watching society makes and sells simple bird feeders to raise money for its conservation activities. The materials for each feeder cost $5, and the society sells an average of 20 per week at a price of $9 each. The society has been considering raising the price, so it conducts a survey and finds that for every dollar increase, it loses 2 sales per week.

(a) Find a function that models weekly profit in terms of price per feeder. (Let x be the price per feeder and P(x) be the profit.)

Math- Pre calculus - Reiny, Tuesday, November 1, 2011 at 8:34am
Let the number of $1 increases be n

selling price now : 9
number sold now: 20

after increase....
selling price = 9+n
number sold = 20-2n

P(n) = (9+n)(20-2n) - 5(20-2n)

( change my variable to x )

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