The parabola (u sharp thing lol) passes the horizontal (x axis) and it touches the horizontal line twice... this is always. If you look closely it touches 1, -5 ( the negative comes from being to the left side) and since this is your horizontal line both these number go first (1) (-5) then you just include the 0s because the y intercept is always like that majority of times but also bc it’s not touching that lines (vertical line heheh) hope that makes sense.
if the total is $31.50, it is both the blouse and the skirt together, so uf you take away the blouse from the total ($31.50 - $18) then yiu are keft with the price of the skirt
