Which of the following equations is equivalent to 3/4 a - 6 Equals 1/4?

Last saturday, the museum box office sold 281 tickets for a total of $3,954. adults ticket cost $15, and students ticket cost $12. how many of each kind of tickets were sold?

Witch represents the inverse of the function f(x)=1/4x-12

{0,1,2,3,4,5,6,20,21,22,23,24,25} the distribution is considered to be: skewed the right, skewed the left, not skewed?