Plz me! i only have 2 questions. will make brainliest

What is the difference between regular convex and concave polygons

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

In the diagram of circle o, what is the measure of zabc?