Answer:
a
Step-by-step explanation:
Answer:
Option D
Step-by-step explanation:
Generally the equation for Margin of Error is mathematically given by

Condition for Largest M.E
n has to be smallest and Z value has to be largest.
Where
From options
Smallest 
Largest Z value respects to 
Therefore
n= 300, confidence level 95%
Option D
Answer:
6 + 1 + 3
Step-by-step explanation:
- 6 + 1 = 7
- 7 + 3 = 10
I hope this helps!
21 x 9 = 9 x 21 is the commutative property.