Does anyone know how to do any of these types of problems?

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

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.