Evaluate the expression for x = 3 and y = 5. 12x−3y4x−y12x−3y4x−y need this asap

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.