document.write( "Question 753616: Write a rule for the nth term of the arithmetic sequence, then find a23
\n" ); document.write( "d=-2/3,a4=18 \n" ); document.write( "

Algebra.Com's Answer #458580 by KMST(5328) $\"\"$ $\"About$

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$\"a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad\"$
\n" ); document.write( "Since $\"d=-2%2F3\"$ and $\"a%5B4%5D=18\"$ ,
\n" ); document.write( " $\"18=a%5B1%5D%2B%284-1%29%2A%28-2%2F3%29\"$ --> $\"18=a%5B1%5D%2B3%2A%28-2%2F3%29\"$ --> $\"18=a%5B1%5D-2\"$ --> $\"18%2B2=a%5B1%5D\"$ --> $\"a%5B1%5D=20\"$
\n" ); document.write( "So
\n" ); document.write( " $\"a%5B23%5D=a%5B1%5D%2B%2823-1%29%2Ad\"$ --> $\"a%5B23%5D=20%2B22%2A%28-2%2F3%29\"$ --> $\"a%5B23%5D=60%2F3-44%2F3%29\"$ --> $\"highlight%28a%5B23%5D=16%2F3%29%29\"$ or $\"highlight%28a%5B23%5D=5%261%2F3%29%29\"$ \n" ); document.write( "

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