Find all the numbers such that the number added to itself is less than the number subtracted from 6

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Does anyone know how to do geometryme with this problem

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.