Ican evaluate expressions if j=3 k=6 m=12 jk+4m divided by 2

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