Question $7-$ Determinacy & Shear & Moment

a$)$ State whether the following structures are determinate, indeterminate, stable or unstable.

i$)$ Figures $7$a$,7$b & $7$c are shown below

$[10]$

$$

ii$)$

$($a$)$

$0+v$

iii$)$

$($b$)$

m$.$d$.$

$($c$)$

d$)$ Determine the shear and moment in the beam as a function of $x.$ Therefore, write the shear and moment expressions for the beam below as a function of x as depicted in the dia