If 3x − (7 − x) = 29, find the value of 6x.

Hint:
Rewrite 3x − (7 − x) as
3x + −1(7 − x)
and then use the Distributive Property to simplify.

multiple choice:
a. 6x = 54
b. 6x = 45
c. 6x = 46
d. 6x = 60

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected