By definition, the number
is the ratio between the circumference and the diameter:

This implies that

And so your circumference is 
Answer:
k < -5
Step-by-step explanation:
5(k+4)<–5
Divide each side by 5
5/5(k+4)<–5/5
k+4 < -1
Subtract 4 from each side
k+4-4 < -1-4
k < -5
Your answer would be 3160.
Answer:
B
Step-by-step explanation: