What are other questions similar to? :

if f(x) = x^2 - 9 / x^2 - 4, the domain of x is all real numbers except
a) -2 and 2
b) -3 and 3
c) 0
d) 2
e) 2 and 3.

(the answer for this question is a)

Which expressions equal 9 when x=4 and y=1/3 a. x2+6y b. 2x + 3y c. y2-21x d. 5 (x/2) -3y e. 3x-9y

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?