Some amount of billiard balls were arranged in an equilateral triangle. And three balls were extra. When the same set of billiard balls were arranged into triangle in which each side has one more ball than in the first arrangement there were four billiard balls shortage. How many balls were in the set?

Don't know how to find x given these segment lengths

The ratio of wooden bats to metal bats in the baseball coach’s bag is 2 to 1. if there are 20 wooden bats, how many metal bats are in the bag?

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.