Sarah's age is four more than twice her brothers age. write two equivalent algebraic equations that can be used to find their ages.

Lin is shopping for a couch with her dad and heard him ask the salesperson “how much is your commission? ” the salesperson says that her commission is 5 1/2% of the selling price. a. how much commission will the salesperson earn by selling a couch for $495? b. how much money will the store get from the sale of the couch?

1. are the triangles similar and if so why? what is the value of x? show your work.

Which is the completely factored from of xy^3-x^3y