Find the radius of a plate whose circumference is 87.92 cm

radius would be 14. you get the circumference (87.92) and divide it by pi (3.14) you get 28 which is the diameter and divide it by 2 and you get the radius 14.

Step-by-step explanation:

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value