I don’t really understand the algebraic expression part

Write the fraction or mixed number and the decimal shown by the model

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

If you answer 2+2 you will get over 80 points