document.write( "Question 1087532: a1=5, r=3, a12=? \n" ); document.write( "

Algebra.Com's Answer #701881 by MathLover1(20850) $\"\"$ $\"About$

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it should be geometric sequence if given $\"r\"$ \r
\n" ); document.write( "\n" ); document.write( "In general we write a geometric sequence like this:\r
\n" ); document.write( "\n" ); document.write( "{ $\"a\"$ , $\"ar\"$ , $\"ar%5E2\"$ , $\"ar%5E3\"$ , ..., $\"ar%5E%28n-1%29\"$ }\r
\n" ); document.write( "\n" ); document.write( "where:\r
\n" ); document.write( "\n" ); document.write( " $\"a\"$ is the $\"first\"$ term, and
\n" ); document.write( " $\"r\"$ is the factor between the terms (called the \" $\"common\"$ $\"+ratio\"$ \")\r
\n" ); document.write( "\n" ); document.write( "We can also calculate any term using the rule:\r
\n" ); document.write( "\n" ); document.write( " $\"a%5Bn%5D+=+a%5B1%5Dr%5E%28n-1%29\"$ \r
\n" ); document.write( "\n" ); document.write( "if given:\r
\n" ); document.write( "\n" ); document.write( " $\"a%5B1%5D=5\"$ , $\"r=3\"$ , to find $\"a%5B12%5D\"$ , where $\"n=12\"$ , use the rule above and given data\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"+a%5Bn%5D=a%5B1%5D%2Ar%5E%28n-1%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"+a%5B12%5D=5%2A3%5E%2812-1%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"a%5B12%5D=5%2A3%5E%2811%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"a%5B12%5D=885735\"$ \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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