P=r x 2 x pi
= 3 x 2 x 3.14
= 6 x 3.14 = 18.84
It is not linear because x is raised to the second power. Therefore it is not straight and would be kindof like a rainbow cut in half on the graph..
Answer:
x=40/9
Step-by-step explanation:

Answer : 81 because it is the only one that is not a multiple of 4
Step-by-step explanation: