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From the given formula [tex]S=\frac{1}{2} N(A+I)[/tex],
[tex]N=\frac{2S}{A+I}[/tex]
Given :
Formula is [tex]S=\frac{1}{2} N(A+I)[/tex]
Solve the given equation for N
Our aim is to get N alone .
[tex]S=\frac{1}{2} N(A+I)\\multiply \; both \; sides \; by \; 2\\2S=N(A+I)\\Divide \; both \; sides \; by \; A+I\\\frac{2S}{A+I} =N[/tex]
So from the given formula
[tex]N=\frac{2S}{A+I}[/tex]
Learn more : brainly.com/question/18276420