Prove that circle a with center (–1, 1) and radius 1 is similar to circle b with center (–3, 2) and radius 2.

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radii and altitudes is 2: 1? submit