Q$4-5(4$ pts$.)$

A member $($AB$)$ with a maximum triangular distributed load intensity $80\frac{N}{m}$ and moment $90N.m$ is supported by a pin joint at $\text{'}A\text{'}$ and rested on a smooth support at $B.AB$ is in equilibrium. Select the correct answer and show your work. Sketch FBD$.$

$F_x=c$

${\displaystyle \underset{?}{\overset{?}{}}}{F}_7=0$

$M=0$

$R_A=\sqrt[\phantom{2}]{A{x}^2+Ay}$

Q$4.$ Reaction force $R_B$ at support B

a$.200$ N

b$.340$ N

c$.500$ N

d$.120$ N

e$.175$ N

Q$5.$ Reaction force a $R_A$ at support $A$

a$.345$ N

b$.150$ N

c$.254$ N

d$.300$ N

e$.125$ N