SOLUTION: Please help..the question is use and arithmetic sequence to find how many multiples of seven are between 11 and 391? ive tried setting it up as a1=11 and and a sub n= 391, but i

Question 193594: Please help..the question is use and arithmetic sequence to find how many multiples of seven are between 11 and 391? ive tried setting it up as a1=11 and and a sub n= 391, but i dont know what what to do after that.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Please help..the question is use and arithmetic sequence to find how many multiples of seven are between 11 and 391? ive tried setting it up as a1=11 and and a sub n = 391, but i dont know what what to do after that.
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14 is the 1st
14 + 7 is the 2nd
14 + 2*7 is the 3rd
...
14 + 53*7 is the 52 and last
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Cheers,
Stan H>
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