Question 934800
# 1


We're adding 7 each time. So d = 7
The first term is 9, so {{{a[1] = 9}}}
This is an arithmetic sequence


{{{a[n] = a[1]+d(n-1)}}}


{{{a[n] = 9+7(n-1)}}}


{{{a[n] = 9+7n-7}}}


{{{a[n] = 7n+2}}}


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# 2


I'm not sure what the rule is here. So repost this question separately so others may see it and help you out.


The rule <i>may</i> be: add 2, add 3, add 2, add 3, ...


but that rule may be wrong.


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# 3


We subtract 11 each time, so d = -11
First term: {{{a[1] = 68}}}
This is an arithmetic sequence



{{{a[n] = a[1]+d(n-1)}}}


{{{a[n] = 68+(-11)(n-1)}}}


{{{a[n] = 68-11n+11}}}


{{{a[n] = -11n+79}}}

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