David lays bricks at a rate of 40 brick per hour. if he has a large job laying 2,400 bricks, how many hours will it take him to finish? If David works 8 hours per day , how many days will he work on this project?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.