To cover a wall that measures 144 ft², you would need:
0.41 gallons of paint (rounded to two significant figures).
This is calculated by dividing the area of the wall (144 ft²) by the area that one gallon of paint can cover (350 ft²), which gives us:
144 ft² ÷ 350 ft²/gallon = 0.4114285714 gallons
We then round this number to two significant figures, which gives us 0.41 gallons.