Examine each table and formulate the rule to show the relationship between the two quantities.

1. The store owner would like to know the total number of cases of soft drinks sold for a given number of days.

Number of days : 1 2 3 4 5 Number of cases of : 42 84 126 168 210 soft drinks sold 

2.The school principal would like to project the number of students based on the number of years of school operation

Number of years of operation: 1 2 3 4 5 Number of students : 350 410 470 530 590 

3.The taxi passenger would like to know the taxi fare for the distance covered.

Number of kilometers: 1 2 3 4 5 Taxi fare : 75 90 115 140 165 

4.The population of a certain type of bacteria for a particular time.

Time in minutes : 0 1 2 3 4 Population of bacteria: 20 40 80 160 320 

5.The fee in the parking area.

Time : 0 2 4 6 8 Parking Fee: 20 50 90 130 170