A voluntary response sample is always valid.
Answer:
Step-by-step explanation:
at the center of it's gravity
Answer:
D
Step-by-step explanation:
If you work backwards and add everything up it works.
Answer:
hope this will help you........
Answer:
The answer is below
Step-by-step explanation:
Given the time taken to answer each multiple choice question as one minute, the time taken to x multiple choice question = 1 minute/question × x questions = x minutes
Given the time taken to answer each essay question as six minute, the time taken to y essay question = 6 minute/question × y questions = 6y minutes
Therefore the total time taken to complete X multiple choice question and y essay questions = the time taken to x multiple choice question + the time taken to y essay question = x + 6y
