Posted by **ASDFGHJKL;** on Thursday, November 10, 2011 at 5:10am.

S = n/2 (a+1)

The subject of the formula is L

Same as before, please include workings TYVM

- Math -
**drwls**, Thursday, November 10, 2011 at 5:14am
There is no L in your formula.

You seem to be confusing 1, l and L.

You still need to know how to use parentheses to avoid ambiguity in typed equations.

- Math -
**ASDFGHJKL;**, Thursday, November 10, 2011 at 5:17am
Oh sorry yes thats what i mean:

S = (n/2)*(a+L)

- Math -
**Anonymous**, Thursday, November 10, 2011 at 6:48am
S = (n/2)*(a+L)

S/(n/2) = a + L

2*S / n = a + L

(2*S / n) - a = L , or

L = (2*S / n) - a

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