Could someone me i don’t understand. it is slopes.

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

If you had $1,900,000, how many days would it take you to spend all if you spent $1 a second. (there are 86,400 seconds in a day)