Determine whether the function is continuous or discontinuous. Justify your reasoning. If discontinuous, identify points of discontinuity. Please I need urgent help Brainliest to the first question Also note the equations follows with "if x is..."

Ill mark the brainliest if you me with the these three questions 7,8,9

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

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