Write a percent equation that can be used to solve the following problem: 820 is 20% of what number? A. n = 0.2 x 820
B. 820 = 0.2 × n
C. 0.2 = n × 820
D. none of these

Find the length of cu, the triangles are similar.

How far is x from 5 on a number line?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?