document.write( "Question 1082519: Sn=1550, n=3, r=5 Find a1. \n" ); document.write( "

Algebra.Com's Answer #696591 by ikleyn(52798) $\"\"$ $\"About$

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document.write( "a + a*5 + a*5^2 = 1550  ---->\r\n" );
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document.write( "a*(1 + 5 + 25) = 1550  ---->\r\n" );
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document.write( "31a = 1550  ---->  a =  = calculate.\r\n" );
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