document.write( "Question 125365This question is from textbook algebra and trigonometry with analiytic geometry
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\n" ); document.write( "As a particle moves along a straight path, its speed v (in cm/sec) at time t (in seconds) is given by the equation v= t^4 - 49t^2 + 60 . For what subintervals of the time interval [6,9] will its speed be at least 60 cm/sec?\r
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As a particle moves along a straight path, its speed v (in cm/sec) at time t (in seconds) is given by the equation v= t^4 - 49t^2 + 60 . For what subintervals of the time interval [6,9] will its speed be at least 60 cm/sec?
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\n" ); document.write( "t^4-49t^2+60 >= 60
\n" ); document.write( "t^4-49t^2>=0
\n" ); document.write( "t^2(t+7)(t-7)>=0
\n" ); document.write( "In the interval [6,9], 7<= t <= 9, or [7,9]
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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