z varies jointly with y and the square of x. If z= 252 when y= -7 and x= -3 , find z when x = -2 and y= 2

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

Do you mind if you guys me with this question i’m on number 8

Which is the focus of a parabola with equation y2=4x