After writing a $400 check to pay a bill, a student had a balance of $550 in his account. How much did he have in the account before he wrote the check? a) Let x= his balance before writing the check. Write the equation you would use to solve this problem.

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.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Kai walked one and two-thirds of a mile on saturday and four and one-sixth of a mile on sunday. how many miles did kai walk?