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