document.write( "Question 1052540: the 10th term of an A.P is-27 and the 5th term is -12, what is the 18th term? \n" ); document.write( "
Algebra.Com's Answer #667890 by Fombitz(32388)\"\" \"About 
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\"a%5B10%5D=a%5B1%5D%2B%2810-1%29%2Ad=-27\"
\n" ); document.write( "1.\"a%5B1%5D%2B9d=-27\"
\n" ); document.write( "and
\n" ); document.write( "\"a%5B5%5D=a%5B1%5D%2B%285-1%29%2Ad=-12\"
\n" ); document.write( "2.\"a%5B1%5D%2B4d=-12\"
\n" ); document.write( "Subtracting 2 from 1,
\n" ); document.write( "\"a%5B1%5D%2B9d-a%5B1%5D-4d=-27-%28-12%29\"
\n" ); document.write( "\"5d=-15\"
\n" ); document.write( "\"d=-3\"
\n" ); document.write( "Then,
\n" ); document.write( "\"a%5B1%5D%2B4%28-3%29=-12\"
\n" ); document.write( "\"a%5B1%5D=0\"
\n" ); document.write( "So then,
\n" ); document.write( "\"a%5B18%5D=a%5B1%5D%2B%2818-1%29%2Ad\"
\n" ); document.write( "\"a%5B18%5D=0%2B17%28-3%29\"
\n" ); document.write( "\"a%5B18%5D=-51\"
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