Mrs. Williams is deciding between two field trips for her class. The Science Center charges $150 plus $5 per student. The Dino Discovery Museum simply charges $11 per student. For how many students will the Science Center charge less than the Dino Discovery Museum

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.