This graph shows how the total pages of notes in Charlotte's notebook depends on the number of hours she spends in class.
10
20
30
40
50
60
70
80
90
100
10
20
30
40
50
60
70
80
90
100
0
Number of pages
Time in class (hours)
Pages of notes
After attending 30 hours of class, how many total pages of notes will Charlotte have in her notebook?