SOLUTION: the revenue R in dollars for the sale of x items at Joe's Dollar Store can be modeled by the equation R=1400x-5x^2. what number of items would provide a revenue of $16,080?

Question 134543: the revenue R in dollars for the sale of x items at Joe's Dollar Store can be modeled by the equation R=1400x-5x^2. what number of items would provide a revenue of $16,080?
Found 2 solutions by vleith, checkley71:
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Given :
what number of items would provide a revenue of $16,080?

Use the quadratic equation

(280 -+ 256)/2
x = 12 , 268
Check answers
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
R=1400X-5X^2
16,080=1400X^2-5X^2
5X^2-1400X+16,080=0
5(X^2-280X+3216=0
5(X-268)(X-12)=0
X-268=0
X=268 ANSWER.
X-12=0
X=12 ANSWER.

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