The answer is C 9/2 x 1/3
I hope this answer helps, it’s kinda messy, but it’s still understandable (I guess)
Answer:
......No
.......Yes
.....No
......Yes
Step-by-step explanation:
Let the number of students in Byran's homeroom who have tickets to attend the school's musical be m.
Then 4 more than half this number is written as: 
According to thee given statement, this expression is equal to 20.

We can subtract
from both sides to create an equivalent expression.

The cross of the position vectors is
.. [5, 2, 2] × [6, -1, 1] = [4, 7, -17] . . . . . the normal vector of the desired plane
Since the origin is a point in the plane, its equation can be written as
.. 4x +7y -17z = 0