Answer:
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Only those cells names. Most common mistake in excel. If you want to sort rows make sure you highlight everything and then use sort function on column
        
             
        
        
        
Answer:
Encryption Keys 
Explanation:
In order to make sure only the intended recipient receives the information, encryption keys rely on a unique pattern, just like your house key, except instead of grooves and ridges encryption keys use numbers and letters. 
 
        
             
        
        
        
Answer:
count_p = 0
count_n = 0
total = 0
while True:
    number = int(input("Enter an integer, the input ends if it is 0: "))
    if number == 0:
        break
    else:
        total += number
        if number > 0:
            count_p += 1
        elif number < 0:
            count_n += 1
print("The number of positives is: " + str(count_p))
print("The number of negatives is: " + str(count_n))
print("The total is: " + str(total))
print("The average is: " + str(total / (count_p + count_n)))
Explanation:
Initialize the variables, count_p represens the number of positives, count_n represents the number of negatives, and total represents the total of the numbers
Create a while loop iterates until the user enters 0. If the number is not 0, then add it to the total. If the number is greater than 0, increase count_p by 1. If the number is smaller than 0, increase count_n by 1.
When the loop is done, print the count_p, count_n, total, and average