42.5 is what percent of 212.5?

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

Ineed i been stuck on this question since yesterday

How many solutions does the nonlinear system of equations graphed below have?