What is the value of the rational expression below when x is equal to 3?
15-x over 9-x (15-x/9-x)

a) 3 over 2 (3/2)
b) 5 over 3 (5/3)
c) -2
d) 2

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