What is -9(4f-6f)+(-15f) i need the answer asap

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

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?

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