The line graph shows the number of concert tickets sold from Wednesday to Sunday.

1. What is the difference between the highest and the lowest number of concert tickets sold from Wednesday to Sunday?
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 (Friday)
Lowest number of concert tickets sold = 1100 (Thursday)

Difference between the highest and the lowest number of concert tickets sold from from Wednesday to Sunday
= 4100 - 1100
= 3000

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

Between Wednesday to Thursday, the number of tickets sold decreased the greatest.

To show: 

Decrease in the number of concert tickets sold from Wednesday to Thursday
= 3200 - 1100
= 2100

Increase in the number of concert tickets sold from Thursday to Friday
= 4100 - 1100
= 3000

Decrease in the number of concert tickets sold from Friday to Saturday
= 4100 - 3600
= 500

Increase in the number of concert tickets sold from Saturday to Sunday
= 3800 - 3600
= 200

Answer(s): (a) 3000; (b) Wed to Thu