You get on an elevator on the first floor of a building with 10 floors. You push the button for the fifth floor. A random person gets on before the door closes and chooses a floor. What is the probability that the other person gets off the elevator before you? (Assume you exit together if you go to the same floor.)

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33