Question 657227: L=a+d(n-1)
Solve for N
Answer by colliefan(242)   (Show Source):
You can put this solution on YOUR website! Remember: what you do to one side of the equation, you must do to the other. If you do that, the 2 sides continue to be equal, but the equation changes form.
L=a+d(n-1)
Subtract a from both sides:
L-a=a-a+d(n-1)
L-a=0+d(n-1)
L-a=d(n-1)
Divide both sides by d:
(L-a)/d=d(n-1)/d
(L-a)/d=(n-1)d/d
(L-a)/d=(n-1)*1
(L-a)/d=(n-1)
(L-a)/d=n-1
Add 1 to both sides:
((L-a)/d)+1=n-1+1
((L-a)/d)+1=n+0
((L-a)/d)+1=n
n=((L-a)/d)+1
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