How do you solve this using the quadratic formula? can you explain ?

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Complete the equation of the live through (-1,6) (7,-2)

The dance committee of pine bluff middle school earns $72 from a bake sale and will earn $4 for each ticket they sell to the spring fling dance. the dance will cost $400 write an inequality to determine the number, t of tickets the committee could sell to have money left over after they pay for this year's dance. what is the solution set of the inequality?