When using a coordinate system how is the angle or direction of a vector determined with respect to the axes of the coordinate system

What is the length x of the side of the triangle below? (hint: use the cosine function)

If a balloon is taken outside on a very cold day, what will occur?

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603