How do i find the equation for a tangent line without derivatives?

Find the balance at the end of 4 years if 1000 is deposited at the rate of

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.

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?