I knnow the answer for $6$ is $\backslash (\backslash$mathrm$\{$C$\}\backslash$& $\backslash$mathrm$\{$D$\}\backslash )$ and for $7$ is $\backslash (\backslash$mathrm$\{$A$\}\backslash$mathrm$\{\backslash$& C$\}\backslash )$ could you explain why and show working for question $\backslash (7.\backslash$mid $\backslash )$

Questions $6$ and $7$ below are based on the manometer shown in the figure above. Note that bulb $\backslash ($ B $\backslash )$ is open to the atmosphere which can be assumed to be at a pressure of $1$ atm $.$ Use information provided in the appendix for the fluids' properties.

$6.$ Which TWO of the following points has the same pressure? $($Select TWO.$)$

$[$MA: $2$ marks$]$

$($A$)\backslash ($ A $\backslash )$

$($B$)\backslash ($ B $\backslash )$

$($C$)\backslash ($ C $\backslash )$

$($D$)\backslash ($ D $\backslash )$

$($E$)\backslash ($ E $\backslash )$

$7.$ Which of the following is$/$are correct?

$[$MA: $5$ marks$]$

$($A$)$ The absolute pressure at $\backslash ($ A $\backslash )$ is $111\mathrm{.}4$ kPa $.$

$($B$)$ The pressure in bulb $\backslash ($ A $\backslash )$ is $1\mathrm{.}81$ kPa MORE than the pressure at $\backslash ($ C $\backslash ).$

$($C$)$ The pressure at $\backslash ($ H $\backslash )$ is essentially the same as atmospheric conditions.

$($D$)$ The lowest pressure $($gage$)$ in the system is $3\mathrm{.}33$ kPa $.$