If u have a 90% as a grade but u made a 43 on a unit quizz what is the grade

Plz heeeeeeelp plz give me the answer

Can someone me with the property questions for 12 13 and 14 plz

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