Can someone explain to me how you find k?

For which pair of functions is (gof)(a)=|a|-2?

Someone answer asap for ! 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

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i