$1.80, because 3/4 is half of 1.5, and $1.80 is one half of $3.60.
Hey!~
The order of the fractions from least to greatest would be:
1/5, 2/8, 4/10.
Hope this helps and have a great day!
-Lindsey
The line is called the directrix. Here we have a vertical directrix, so a parabola sideways from usual.
Geometry is best done with squared distances. The squared distance from an arbitrary point (x,y) to the vertical line x=2 is

We equate that to the squared distance of (x,y) to the focus (-2,0):



We could call that done. A more standard form might be