Answer:
Step-by-step explanation:
7-x=-2
-x=-2-7
-x=-9
x=9
Answer:
It’s the third ans
Step-by-step explanation:
The surveyor selects the twentieth student who enters the building. The student do not enter the building to be surveyed but for other reasons and the researcher take advantage of that and selects them. This is a form of continence sampling.
The researcher selects every twentieth student and not any other. Therefore, the sampling is systematic in nature.
Finally, students selected to participate in the survey are free to choose if to participate in he survey or not. Therefore, it is voluntary kind of sampling.
Therefore, the applicable sampling methods are convenience, systematic, and voluntary.
Answer:
-y=5-x
Step-by-step explanation:
The first equation tells you that 
. If you substitute this expression for 
in the second, we have
And we can deduce 
