Plz explain , i want to know how to do

the circumference of a circle is 12.3π in. what is the radius of the circle?
a) 3.9 in
b) 5.75 in
c) 6.15 in
d) 10.1 in

Which statement best explains whether the table represents a linear or nonlinear function? input (x) output (y) 2 5 4 10 6 15 8 20 it is a linear function because the input values are increasing. it is a nonlinear function because the output values are increasing. it is a linear function because there is a constant rate of change in both the input and output. it is a nonlinear function because there is a constant rate of change in both the input and output.