Can a spellcaster use a reaction spell and cast a spell in the same

I don't get Hellish Rebuke does hellish rebuke use a spell slot does the if you do clause check? If Lilah is on the battlefield and I cast a plotted spell will lilah trigger and plot the spell again does hollywood park casino have slot machines Hellish rebuke no longer costs a spellslot, only a reaction By request

does ritual casting use a spell slot At Higher Levels When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10 for each slot level above 1st