examday

/TMUA

The cross-section of a triangular prism is an equilateral triangle with side $2x\,\text{cm}$. The length of the prism is $d\,\text{cm}$.

Let the total surface area of the prism be $T\,\text{cm}^2$. Given that the volume of the prism is $T\,\text{cm}^3$, which one of the following is an expression for $d$ in terms of $x$?