There were 75 customers in the store at 1: 00. the store must be emptied of customers when it closes at 5: 00. how many customers must leave the store between 4: 00 and 5: 00?

87 customers

Step-by-step explanation:

Consider the below table is attached with this question.

From the below table it is clear that the number of customers entered between 1:00 to 4:00 is

The number of customers leaved between 1:00 to 4:00 is

Total change in the number of customers between 1:00 to 4:00 is

There were 75 customers in the store at 1:00.  So, total number of customers at 4:00 is

The store must be emptied of customers when it closes at 5:00

Therefore, 87 customers must leave the store between 4:00 and 5:00.

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation: