The one is the same everywhere so we ignore it.
Choice B
Answer:
A prospective study
Step-by-step explanation:
A prospective study watches for outcomes, such as the development of a disease (in this case cancer). It also usually involves taking a group of subjects and watching them over a long period of time. The outcome of interest should be common between them (whether certain smoking habits lead to the development of cancer in British doctors).
Answer:
x = 31
Step-by-step explanation:
13 + 6 + 2x - 18 = 4x - 29
1 + 2x = 4x - 29
30 + 2x = 4x
30 = 2x
15 = x
4(15) - 29
60 - 29
31 is the unknown measurement
