En una caja que contiene 4 corbatas negras 5 azules y 6 verdes. Se extraen al mismo tiempo dos corbatas al azar. ¿Cuál es la probabilidad de que ambas sean negras? cuel de estas son ? 15/3, 15/4, 16/210, 10/12

The tangent of an angle is not which of the following? a) ratiob) proportionc) fractiond) opposite over adjacent

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.