The line graph shows the number of concert tickets sold from Tuesday to Saturday.

1. What is the difference between the highest and the lowest number of concert tickets sold from Tuesday to Saturday?
2. Between which 2 days did the number of tickets sold decrease the greatest? Give your answer in the following format.  (Eg Mon to Tue)

(a)
Highest number of concert tickets sold = 4100 (Wednesday)
Lowest number of concert tickets sold = 1500 (Saturday)

Difference between the highest and the lowest number of concert tickets sold from from Tuesday to Saturday
= 4100 - 1500
= 2600

(b)
To find the greatest decrease in the number of tickets sold, look for the steepest decreasing slope.

Between Friday to Saturday, the number of tickets sold decreased the greatest.

To show: 

Increase in the number of concert tickets sold from Tuesday to Wednesday
= 4100 - 2200
= 1900

Decrease in the number of concert tickets sold from Wednesday to Thursday
= 4100 - 3000
= 1100

Increase in the number of concert tickets sold from Thursday to Friday
= 3500 - 3000
= 500

Decrease in the number of concert tickets sold from Friday to Saturday
= 3500 - 1500
= 2000

Answer(s): (a) 2600; (b) Fri to Sat