document.write( "Question 930354: if betty paints a fence in 5 hours and mark paints it in 3 hours, how long would it take if they worked together
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Algebra.Com's Answer #564906 by TimothyLamb(4379) $\"\"$ $\"About$

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r = w/t
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\n" ); document.write( "rates are additive:
\n" ); document.write( "1/5 + 1/3
\n" ); document.write( "3/15 + 5/15
\n" ); document.write( "8/15
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\n" ); document.write( "t = w/r
\n" ); document.write( "t = 1/(8/15)
\n" ); document.write( "t = 15/8
\n" ); document.write( "t = 1.875 hours
\n" ); document.write( "t = 1 hour and (0.875 * 60 minutes/hour)
\n" ); document.write( "t = 1 hour and 52.5 minutes
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\n" ); document.write( "Solve and graph linear equations:
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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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