Table:
0
A
B
C
D
E
F
1
notes id
student id
teacher id
date of notes
text of notes
other details
2
1
7
3
4/15/1978 4:49
3
2
11
10
6/30/2005 2:48
4
3
15
3
6/9/1988 0:24
5
4
12
9
8/15/1991 1:22
6
5
4
10
5/5/1971 20:07
7
6
12
6
1/31/2014 2:05
8
7
12
7
12/13/1984 23:04
9
8
7
14
4/11/1988 4:56
10
9
14
15
4/27/1972 4:51
11
10
13
6
12/14/2017 8:21
12
11
3
14
8/16/1993 17:39
13
12
1
1
8/20/1991 8:03
14
13
13
3
4/28/2014 2:07
15
14
14
15
11/26/1974 4:23
16
15
1
9
9/10/1984 1:18

Questions and formulas:
Question: Number of notes.
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy