Idon't understand any of the question numbers

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

If a line is defined by the equation y = 5x + 2, what is the slope?

There are 93 calories in a small candy bar how many calories are ther in a half dozen small candy bars?