What’s the answer to this??!

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Ineed with number 6 , explain how to get 1978

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