Which expression is a factor of 3ab-6a+4b-8

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

The sequence [tex]a_{n}[/tex] = 5n + 3 is the same as the sequence [tex]a_{1} = 8, a_{n} = a_{n-1} +5[/tex]

Will make the following data show the scores of some students in a competition: 12 points, 21 points, 29 points, 17 points, 24 points, 23 points, 28 points which box plot represents the data?