Please help this is due today in 15 minutes please help god bless will give brainliest

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

Find the amplitude of a sinusoidal function that models this temperature variation