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The compound beam is subjected to a uniform dead load of $0\mathrm{.}8k\frac{N}{m}$ and a single concentrated live load of $4kN.$ Determine $($a$)$ the maximum moment created by these loads at $C,$ and $($b$)$ the maximum shear at $B.$ Assume $A$ is a roller, $B$ is a pin, and $C$ is fixed.

$$Tip:this question is to find maximum negative value

$$ Hint: when finding the maximum value the positive maximum is a maximum and conversely $,$ the negative maximum is also a maximum