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S = n/2 (a+1)

The subject of the formula is L

Same as before, please include workings TYVM

  • Math -

    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 -

    Oh sorry yes that's what i mean:

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

  • Math -

    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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