$1.$ The figure shows three forces $(1\mathrm{.}5$ kip, $400$ lb$,200$ lb$)$ acting on a $100-$lb block on an incline. a$.$ Write each applied force and the weight of the block as Cartesian force vectors,b$.$ Calculate the resultant of these four forces acting on this block and express it as a Cartesian force vector, ac$.$ Draw the resultant force vector you found in part $($b$)$ and find the angles it makes with the e horizontal and vertical axes.