A positive number
This is because you must add to get from a negative number in order to get to a positive number.
You multiply 3.14 by the diameter or 2 times the radius
for area you do pi or 3.14*radius squared
C. Plumber A and Plumber B will both charge $135 if they each work 2.5 h.
For the mean you add them all up and divide by the ammount of numbers you added. So it would be 118