What are the solutions of the equation x^4-5x-^2-14=0

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

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?