document.write( "Question 366489: If 3, 6, 12, 2y + 6 is a geometric sequence, what is the value of y? \n" ); document.write( "

Algebra.Com's Answer #261185 by Fombitz(32388) $\"\"$ $\"About$

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Look at the differences between terms,
\n" ); document.write( " $\"6-3=3\"$
\n" ); document.write( " $\"12-6=6\"$
\n" ); document.write( "The next difference should be $\"9\"$
\n" ); document.write( " $\"%282y%2B6%29-12=9\"$
\n" ); document.write( " $\"2y-6=9\"$
\n" ); document.write( " $\"2y=15\"$
\n" ); document.write( " $\"highlight%28y=15%2F2%29\"$
\n" ); document.write( " \n" ); document.write( "

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