What is the iqr (inter quartile range) for the data set?

11 6 19 14 21 7 13 15 15

question 9 options:

8

9

15

17

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

What is the factor form of x^2-9x+14