\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A water tank already contains \(35\) liters of water and fills at a rate of \(10\) liters per minute. Let \(x\) be the number of minutes the tank has been filling. Find \(f(x)\) be the total amount of water in the tank in liters.
\(f(x) =\)
liters