Percent and problem solving: sales tax
1. a new large tv has a purchase price of $4790. if the sales tax on this purchase is $335.30, find the sales tax rate.

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.