document.write( "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.\r
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Algebra.Com's Answer #797769 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "to determine the number of t-shirts that must be sold to break even,\r\n" );
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document.write( "solve the equation  -x^2 + 30x + 400 = 0 and use its positive root.\r\n" );
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document.write( "To solve it quickly, use factoring.\r\n" );
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