Whenever you sign a lease for an apartment, you typically have to pay a security deposit before you even move in; this is in case something happens while you are occupying the apartment and repairs have to be made. one apartment building has apartments that rent for $900 a month and a security deposit of $600. write an equation to represent the situation described. f(x) = 600x + 900 f(x) = 600x - 900 f(x) = 900x - 600 f(x) = 900x + 600