The heights, in cm, of 50 students are recorded and used to draw the cumulative frequency graph shown below.
501
40
30
Cumulative frequency
Use the graph to estimate the number of
these students with a height above 150 cm.
20
students
10
170
160
120
130
140 150
Height (cm)

6, 10

9, -13

12, -21

18, -23

step-by-step explanation:

you just add 6 to the x-coordinate and subtract 10 from the y-coordinate.

56

step-by-step explanation:

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.