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Which is the 25th term of the arithmetic sequence where a1 = 7 and a9 = 71 ?
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the general formula is: an=a1+(n-1)d from this equation you can determine d then determine a25
can you give me the answer? I am checking to see if i got it right. my answer is 151.
@ghass1978
There are 8 equal steps between 7 and 71. What is the step size?
What are you talking about? I just need the answer...to check. Am I right or wrong?
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you're wrong d=8 so a25=7+24.8=199
okay thank you.
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