HPLC Determination of a ternary mixture.

You are provided with a typical chromatogram resulted from separation of a certain ternary mixture $($B$,$C$,$D$)$ using $C18$ column of a length $15cm$ using mobile phase $(70\%$ acetonitrile and $30\%$ water$)$ I$-$ Use this chromatogram to obtain values of the following required parameters :

Where;

$($a$)$ Solvent front $($mobile phase$).$

$\backslash$table$[[$Sequired Parameter,$],[1-$ NTP$($c$),],[2-$ NTP$($d$),],[3-$ HETP$($b$),],[4-$ HETP$($c$),],[5-$ K$\text{'}($c$),],[6-$ K$\text{'}($d$),],[7-$ Resolution factor for c and d$,],[8-$ Selectivity factor for b and c$,],[9-$ Velocity of solute c$,],[10-$ Identify the most polar compound,$]]$

II$-$Apply the following regression equations to determine the concentrations of compound $d$ and $c$ using the peak height:

$1-$ Peak Height $($d$)=0\mathrm{.}05+0\mathrm{.}2C$

$2-$ Peak Height ${?}_{(c)}=0\mathrm{.}025+0\mathrm{.}16C$