Acircle has a diameter of 8 m.
what is the circumference of the circle? (express your answer using π.)
a. 8/π m
b.π/8 m
c.8π m
d.16π m

What is a rational number between 9.5 and 9.7

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.