The circumference of a circle is 18.84 millimeters. what is the circle's area

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212