Norman decided to let the sister's age be x, and mike's age be x+2. he then write the equation x+x+2=30 show norman how to set up and solve the problem correctly

Can someone me and do the problem plz so i can understand it more better

Ineed with this problem 21 show steps

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