Evaluate the definite integral. π/18 cos(9x) sin(sin(9x)) dx 0

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

How is working backward similar to solving an equation?

Math it's appreciated. (picture provided)