First we need to figure out the area of Taylor's deck.
Area of a rectangle = length * width
Area = 42 * 28
Area = 1176 square feet
A gallon of paint covers about 350 square feet. So, to find out how many gallons of paint Taylor needs, we have to divide the total area of his deck by the amount of deck that one gallon covers.
Gallons = 1176 / 350
Gallons = 3.36
However, Taylor cannot buy a fraction of a gallon of paint, and he can't leave some of his deck unpainted.
Therefore, Taylor needs 4 gallons of point to cover the entire deck.