How do we solve problems involving percent of change such as discou commission, sales tax, and simple interest?

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

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