How to solve for the roots of a quadratic function when a=0?

Which fraction below is equivalent to 10/12?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

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