algebra word problem
posted by Anonymous on .
To remodel a bathroom a contractor Charles $25 er hour plus material costs, which amount to $3825. Therefore, the total cost to remodel he bathroom is given by f(x)=25x+3825 where x is the number of hours the contractor works. Find a formula for f^1(x). What does f^1 compute?
Thanks for your help:)

Switch the variables x and y
y=25x+3825 would become
x=25y+3825 (solve for y)
x3825=25y
y=(x3825)/25
and if you do f(fx) meaning you plug in the inverse into the x of the original function, you should get x.