Answer:
Step-by-step explanation:
1)140
2)70
The language art teacher wants to know the opinion of the ENTIRE school, so it would be fair if the teacher takes a sample from the ENTIRE school population. She can use the stratified sampling method where she can take a proportionate sample from each grade.
Correct answer: All students in each grade
From here, just make it inverse:

Answer:
17/6
So this is the answer. If you want to convert to decimal... The answer will be 2.83..hope it is right
area = 7×2+7×2+11×2 = 50sq ft