document.write( "Question 528657: What is the value of A+B if the A is the fist term and the B is the common difference of the sequence whose 4th term is 3 and 20th term is 35? \n" ); document.write( "

Algebra.Com's Answer #349376 by Maths68(1474) $\"\"$ $\"About$

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an = a1 + (n – 1)d
\n" ); document.write( "n=4
\n" ); document.write( "an=3
\n" ); document.write( "3=a1+(4-1)d
\n" ); document.write( "3=a1+3d........(1)
\n" ); document.write( "an = a1 + (n – 1)d
\n" ); document.write( "n=20
\n" ); document.write( "an=35
\n" ); document.write( "35=a1+(20-1)d
\n" ); document.write( "35=a1+19d........(2)
\n" ); document.write( "Subtract (1) from (2)
\n" ); document.write( "35=a1+19d
\n" ); document.write( "-3=-a1-3d
\n" ); document.write( "----------------
\n" ); document.write( "32=16d
\n" ); document.write( "32/16=d
\n" ); document.write( "2=d
\n" ); document.write( "d=2
\n" ); document.write( "Put the value of d in (1)
\n" ); document.write( "3=a1+3d........(1)
\n" ); document.write( "3=a1+3(2)
\n" ); document.write( "3=a1+6
\n" ); document.write( "3-6=a1
\n" ); document.write( "-3=a1\r
\n" ); document.write( "\n" ); document.write( "First term = A =-3
\n" ); document.write( "Common Difference = B = 2\r
\n" ); document.write( "\n" ); document.write( "A+B=-3+2=-1 \n" ); document.write( "

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