Solve for x? this is apart of my final I could really use the help​

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?