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.
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Quadratic Equations and Parabolas
-> 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.
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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):
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.
