Answer:

Step-by-step explanation:
The computation of the fractions of the students wearing either a white shirt or blue shirt is as follows:

Hence, the fractions of the students wearing either a white shirt or blue shirt is 
The answer is 21! - hope it helps
Answer:
sure
Step-by-step explanation:
Step-by-step explanation:
diameter = 2 × radius.
15.5 = 2 × r.
r = 15.5 ÷ 2.
r = 7.75.
volume = πr²
v = π × 7.75².
v = 188.7.
I ain't confident about the volume answer but, the diameter answer is correct.
hope it helps. :)
Pyramids or Prisms can have 7 or more vertices.