1.

In the formula `S=(n)/(2)[2a+(n-1)d]`, make a as the subject of the formula.

Answer» Given `S=(n)/(2)[2a+(n-1)d]`
`implies(2S)/(n)=2a+(n-1)d`
`implies2a=(2S)/(n)-(n-1)d`
`impliesa=(S)/(n)-(n-1)(d)/(2)`


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