Select the expression for the elastic curve using the coordinate $x$ for $0x9ft,$ where $x$ is in feet.

$\frac{1}{EI}(6\mathrm{.}75x^3-0\mathrm{.}01389x^5-81x^2)kip*f{t}^3$

$\frac{1}{EI}(12\mathrm{.}5x^3-0\mathrm{.}02798x^5-60\mathrm{.}72x^2)kip*f{t}^3$

$\frac{1}{EI}(2\mathrm{.}25x^3-0\mathrm{.}002778x^5-40\mathrm{.}5x^2)kip*f{t}^3$

$\frac{1}{EI}(0\mathrm{.}75x^3-0\mathrm{.}000556x^5-20\mathrm{.}25x^2)kip*f{t}^3$

$9$ft$3$ kip$/$ft