Letter d is s geometric sequence. You multiply or divide by the same number (r), common ratio to be a geometric sequence
Answer: a) 453 b) 1537
Step-by-step explanation:
As per given , we have
Margin of error : E= 0.025
Critical value for 95% confidence interval : 
a) The prior estimate of population proportion : p=0.08
Required sample size :-

The minimum sample size is 453 U.S. adults.
b) Since the prior estimate of population proportion is not available , so we take p= 0.5
Required sample size :-

The minimum sample size is 1537 U.S. adults.
Answer:
40-9x+4x+5=
45-5x
You can't do anything else because the variables are different.