Using pi, explain the relationship between the circumference and diameter of a circle.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m