Which equation is a linear function ​

What is the approximate circumference of the circle shown below?

The length of the largest fish is 967.74 times greater than the length of the smallest fish. select a variable expression that shows the length of the largest fish, if 8 is the length of the smallest fish. a. s + 967.74 b. \[ \frac{967.74}{s} \] c. 967.74 - s d. 967. 74s

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.