A store offers packing and mailing services to customers. The cost of shipping a box is a combination of a flat packing fee
of $5 and an amount based on the weight in pounds of the box, $2.25 per pound. Which equation represents the shipping
cost as a function of x, the weight in pounds?
f(x) = 2.25x +5
f(x) = 5x + 2.25
Of(x) = 2.25x - 5
Of(x) = 5x -2.25