She sells 1 and one third of a pie for $34 how much does she earn per pie

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2