Please help!! At least explain what R has to do with it and what it means because I'm so lost and really need help. 20 points + Brainiest. I want to be done please.

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

52 cm radius = diameter = area = circumference = circumfer

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points