256 equals j subtracted from 199

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

If you had $1,900,000, how many days would it take you to spend all if you spent $1 a second. (there are 86,400 seconds in a day)

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)