Algebra.Com's Answer #622365 by MathTherapy(10552)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "For an arithmetic sequence, find t(n) if:
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document.write( "a. t(3)= 6.5 and s(8)=67\r
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document.write( "b. t(4)= and s(5)=  \r
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document.write( "Sorry, I really don't know where to start!!
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document.write( "Please write explanations if you can!
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document.write( " _______ ------ eq (i)\r
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document.write( " ------------ eq (ii)
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document.write( " ----- Substituting 6.5 - 2d for  in eq (ii)
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document.write( "67 - 52 = 12d
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document.write( "15 = 12d
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document.write( " , or  \r
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document.write( " --------- Substituting  for d in eq (i)
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document.write( " ------ Substituting for d, and 4 for in equation of an AP
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document.write( "Apply the same concept to b.
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