SOLUTION: The profit on t-shirts sold by a school is determined by the quadratic equation P=-x^2+30x+400 where x is the number of T-shirts sold at $10 each and P is the profit in dollars.

Question 1172677: The profit on t-shirts sold by a school is determined by the quadratic equation P=-x^2+30x+400 where x is the number of T-shirts sold at $10 each and P is the profit in dollars.
a) determine the number of tshirts that must be sold to break even?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.


to determine the number of t-shirts that must be sold to break even,


solve the equation  -x^2 + 30x + 400 = 0 and use its positive root.


To solve it quickly, use factoring.

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