Please help, I have no clue what to do for any of these

Determine the quotient and remainder when (6a3)+11a2-4a-9) is divided by (3a-2) express your answer in the form q(a) + r(a)/d(a)

There are 12 boy and13 girls in a class. if the teacher randomly chooses a student’s name out of a hat what is the probability it will be a girl

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)