Prove tan5utan3u=(tan^24utan^2u)/(1-tan^2 4utan^2u)

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?