document.write( "Question 1058348: z is jointly proportional to x2 and y2. If z = 55 when x = 3 and y =5, find z when x = 5 and y = 2. (Round off your answer to the nearest hundredth.) \n" ); document.write( "

Algebra.Com's Answer #673399 by Fombitz(32388) $\"\"$ $\"About$

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$\"z=kx%5E2y%5E2\"$
\n" ); document.write( "So,
\n" ); document.write( " $\"k=z%2F%28xy%29%5E2\"$
\n" ); document.write( "and
\n" ); document.write( " $\"55%2F%283%2A5%29%5E2=z%2F%282%2A5%29%5E2\"$
\n" ); document.write( " $\"z=55%2A%28%282%2A5%29%5E2%2F%283%2A5%29%5E2%29\"$
\n" ); document.write( " $\"z=55%2A%284%2F9%29\"$
\n" ); document.write( " $\"z=220%2F9\"$
\n" ); document.write( " \n" ); document.write( "

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