Sam is 3 years younger than marco. marco is 15 years old. how old is sam? let x represent sam's age (there are 2 correct answers) x + 15 = 3 x + 3 = 15 15 divided by x = 3 3 x = 15 15 - x = 3

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