Which rule describes the relationship between the 2- and y-coordinates in the following table? T
y
1
6
4
15
6
21
Choose 1
Multiply z by 6 to get y.
Multiply x by 3. Then add 3 to the result to get y.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

If a is a nonzero real number then the reciprocal of a is