Determine whether each of these sets is countable or uncountable. for those that are countably infinite, exhibit a one-to-one correspondence between the set of positive integers and that set.
a) integers not divisible by 3.
b) integers divisible by 5 but not by 7.
c) the real numbers with decimal representations consisting of all 1s.
d) the real numbers with decimal representations of all 1s or 9s.

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.

It says factor each expression 49x-28?

What is the common difference for this arithmetic sequence? -6,-2,2,6,10 a.4 b.5 c.3 d.6