Suppose you surveyed a group of students to see how many CDs they owned. The results are displayed in the histogram shown below. Based on this histogram, how many students were surveyed?
15
10
5
0
5-8
9-12
13-16 17-20
A. 11
B. 28
C. 33
D. 43

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?