document.write( "Question 817595: A music store sells beginner guitar sets. The manager uses the equation y = -10x squared + 400x +2250 to model his monthly revenue, y. How many guitar sets, x, should he sell to earn the maximum revenue? \n" ); document.write( "
Algebra.Com's Answer #492139 by TimothyLamb(4379)\"\" \"About 
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y = -10x^2 + 400x + 2250
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\n" ); document.write( "the above quadratic equation is in standard form, with a=-10, b=400, and c=2250
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\n" ); document.write( "to solve the quadratic equation, plug this:
\n" ); document.write( "-10 400 2250
\n" ); document.write( "into this: https://sooeet.com/math/quadratic-equation-solver.php
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\n" ); document.write( "from the solver above, the quadratic vertex is a maximum at ( x= 20, y= 6250 )
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\n" ); document.write( "His maximum revenue is $6250
\n" ); document.write( "he achieves that maximum revenue by selling 20 guitar sets
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\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
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\n" ); document.write( "Solve quadratic equations, quadratic formula:
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\n" ); document.write( "Convert fractions, decimals, and percents:
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\n" ); document.write( "Calculate and graph the linear regression of any data set:
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