Final answer:
No, Christine and Oscar did not successfully push Christafer into Mrs. Medrano because their combined force was less than the required 70 N. They need to exert more force in the intended direction to achieve their goal.
Step-by-step explanation:
Christine and Oscar are attempting to push Christafer on the scooter with a combined force to hit Mrs. Medrano. They have calculated that they need a 70 N force but Christine is applying a 20 N force and Oscar a 15 N force, both to the left. The total force they are applying is 20 N + 15 N = 35 N, which is less than the required 70 N. Therefore, Christafer on the scooter would not hit Mrs. Medrano. The correct answer to whether the scooter hit Mrs. Medrano is B) No, they need more force in the opposite direction. To achieve their goal, Christine and Oscar need to exert an additional force that when combined with their current efforts equals or exceeds the required 70 N force to the left.