Divide. do not round your answer. 90.2 ÷ 8.2

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

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?