Find the functions formula

Question

For each trip they charge an initial fee in addition to $0.15 for each vertical meter climbed. For instance the price for climbing all the way to the summit, which is 3500 meters above the base of the mountain is $645 let f(d) denote the few of a trip f(measured in dollars) as a function of the vertical distance climbed d (measured in meters) write the functions formula

Answer 1

f represents the initial fee

 

645 = f + 0.15(3500)

645 = f + 525

120 = f

 

f(d) = 125 + 0.15d