How many km are equal to 18 miles?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Abowl contained 270 starbursts of all different colors. if the probability of picking a yellow is 1/9, then how many yellow starbursts are in the bowl ? ?