document.write( "Question 843458: -the 4th term of an AP is 7 and the 9th term is 17 find the 15th term ??
\n" ); document.write( "-if 4 times the 4th term of an AP is equal to 7 times the 7th term,find its 11th term
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Algebra.Com's Answer #508121 by mathgenboy(3)\"\" \"About 
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The second question: Interpreting the question
\n" ); document.write( "\"4+%2A+4th=7+%2A+7th\"\"4%2A%28a%2B+3d%29=7%2A%28a%2B+7d\"\"4a%2B+12d=7a%2B+49d\"
\n" ); document.write( "collect like terms\"4a-7a=49d-12d\"\"-3a=30d\" divide both sides by -3, then \"a=-10d\". Now \"11th=a%2B+10d\"substitute a=-10d, then \"11th=-10d+%2B+10d\". Therefore \"11th=0\"
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