Cos87°cos33° - sin87°sin33°

Find the roots of the equation below. x^2 - 6 + 9 = 0

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Ten times the square of a non-zero number is eqaul to ninety times the number