Answer: 601
Step-by-step explanation:
The formula to find the minimum sample size(n) , if the prior population proportion is unknown:
, where E = margin of error ,
= critical z-value for confidence level c.
Given : E = 0.04
Z-value for 95% confidence = 1.96
So, the minimum sample size required = 

Hence, the minimum sample size required = 601
Answer:
72 pi + 48 pi= 120pi (not sure if I am right tho)
Step-by-step explanation:
From 5 miles to 16 miles in 11 miles in between.