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1.How long will it take an object to hit ground if it is thrown upward at 47 ft/sec from a height of 63 feet?
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\n" ); document.write( "The height of an object thrown upward equation:
\n" ); document.write( "h = 0 when the object hits the ground
\n" ); document.write( "-16t^2 + 47t + 63 = 0
\n" ); document.write( "Solve this using the quadratic formula
\n" ); document.write( "a=-16; b=47; c=63
\n" ); document.write( "You should get a positive solution: x = 3.9375 sec to hit the ground
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\n" ); document.write( "2.How do you know ahead of time how many roots a quadratic equation will have?
\n" ); document.write( "in the form y = ax^2 + bx + c, the discriminant:
\n" ); document.write( "D = -b^2 - 4*a*c
\n" ); document.write( "D > 0; two distinct real root
\n" ); document.write( "D = 0; one real number solution, a double root
\n" ); document.write( "D < 0; two complex number solutions
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