X + x - x is x
y + y + y is 3y
-z + z - z is -z
x + 3y
An observation study is where nothing changes and you record what is seen. An experimental study you have a control group and a testable group.
The answer would be: .C. The groups in an experiment are chosen at random, but not in an observational study.
Answer:
3.472
Step-by-step explanation:
The angle of the semtrical cube times the number of 2 because of the number in the area. So the anser is 3.472.
Answer: 700
Explanation:
3,500 x 5 over 100 = 175
175 x 4 = 700
