Answer:
752.95
Step-by-step explanation:
Data provided in the question
The standard deviation of population = 210
The Margin of error = 15
The confidence level is 75%, so the z value is 1.96
Now the required sample size is

= 752.95
Hence, the number of college students spends on the internet each month is 752.95
Simply we considered the above values so that the n could come
3+8x-2y-x+1+4y
Combine all like terms and
7x+4+2y is your answer
The answer should be 112 degrees
The first operation performed while evaluating would be to do the parenthesis