50 to 60 as a fraction in simplest form

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

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Acolony contains 1500 bacteria. the population increases at a rate of 115% each hour. if x represents the number of hours elapsed, which function represents the scenario? f(x) = 1500(1.15)" f(x) = 1500(115) f(x) = 1500(2.15) f(x) = 1500(215)