Someone please help me to understand this!

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

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

Askateboard ramp is in the shape of a right triangle what is the height of the ramp