Alan, beatriz, dora and erick met at a party and shook hands exactly once with everyone they already knew. alan shook hands once, beatriz shook hands twice, clara shook hands three times and dora shook hands four times. how many times did erick shake hand?

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.

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

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)