SOLUTION: write a formula for the general term(the nth term) of each arithmetic sequence. Then use the formula for An to find A20.the 20th term of the sequence, 1,5,9,13....

Question 942577: write a formula for the general term(the nth term) of each arithmetic sequence. Then use the formula for An to find A20.the 20th term of the sequence, 1,5,9,13....
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
write a formula for the general term(the nth term) of each arithmetic sequence. Then use the formula for An to find A20.the 20th term of the sequence, 1,5,9,13....
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d = 5-1 = 4
a(1) = 1
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a(20) = a(1)+19*d
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a(20) = 1 + 19*4 = 77
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Cheers,
Stan H.
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