Write an algebraic expression that can get you the final price of an item that cost $x with a 8.5% tax and a 30% discount?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

The function f(x)= -(x+5)(x+1) is down. what is the range of the function?