Show work to these problems

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Draw a tape diagram to represent each situation. for some of the situations, you need to decide what to represent with a variable andre bakes 9 pans of brownies. he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

What is the distance between point a and b