A 30 -lb vertical force $\mathbf{P}$ is applied at $A$ to the bracket shown, which
is held by screws at $B$ and $C$. (a) Replace $P$ with an equivalent force-
couple system at $B$. (b) Find the two horizontal forces at $B$ and $C$
that are equivalent to the couple obtained in part $a .$
(Figure cant copy)