Uhhh.. help, please..

Given a circle with a radius of 3, which equation expresses π as the ratio of the circumference of a circle to its diameter?
A)
= π
B)
= π
C)
= π
D)
= π

The poll report includes a table titled, “americans using cash now versus five years ago, by age.” the age intervals are not equal. why do you think the gallup organization chose the age intervals of 23–34, 35–54, and 55+ to display these results?