Um. i’m pretty sure it’s just 30 feet
Answer:

Step-by-step explanation:
The interquartile range is IQR is:

Where:
= third quartile
= first quartile
So the interquartile range is the difference between the highest quartile and the lowest quartile. In other words, it is the width of the box in the diagram.
So:

The R range is the difference between the highest value and the lowest. In other words:
Finally:

C and D
5·(2+4) is 30, because u need to add parenthesis first. 2+4 is 6
6·5 is 30.
C is 5·6 and that is 30
D is 5·2 which is 10, then 5·4 which is 20. 10+ 20 is 30.
:)