Answer:
atleast 385
Step-by-step explanation:
Given that an electrical power company is looking to expand into a new market. Before they commit to supplying the new area with electricity, they would like know the mean daily power usage for homes there.
Population std deviation = 
Sample size =
STd error of sample mean = 
Margin of error for 95% would be Critical value ( std error)
Here since population std dev is known we can use Z critical value= 1.96

Sample size should be atleast 385
Answer: A
Step-by-step explanation:
Letting
,

Also, the domain of an inverse is the same as the range of the original function, so the range is 
Answer:
75
Step-by-step explanation:
75m/hr
Its the last option because anything between 0 to 1 would he smaller than the original
I believe the answer is D. It takes time for a check to be processed.