Can someone help me with this question, please?

asked Feb 15, 2021 234k views

5 votes

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7 votes

The answer to the first question:

$(28/100)/(72/100)=(7)/(18)=(7)/(n)\\ n=18$

The answer to the second question:

$a_(n)=a_(1)+d(n-1)\\d=a_(2)-a_(1)\\\\d=9\\a_(1)=11\\a_(n)=11+9(n-1)$

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