Problem $6(5$ pts$)$ Refer to the figure to your right for: Replace the force system acting on the frame by a resultant force and specify where its line of action intersects member $AB,$ measured from point $A.$ Use ${336}_{?}$ lb$,250lb$ and $250lb$ instead of $300lb,250lb$ and $200lb$ respectively. For coordinate dimensions, use $4\mathrm{.}5ft,4\mathrm{.}5ft,2ft$ and $4ft$ instead of $2\mathrm{.}5ft,3ft,2ft$ and $4ft$ respectively. Use $40$ instead of $45$ and $9,12,15$ instead of $3,4,5.$ Write $F_R$ in Cartesian vector form.

$F_R=$

$$

$d_{\text{m}\text{e}\text{a}\text{s}\text{u}\text{r}\text{e}\text{d}\text{f}\text{r}\text{o}\text{m}A}$