Find the area of this triangle. Round to the nearest tenth.
7 in
133
13 in
[ ? ) in2

Write the expression 7x^3-28xy^2 as the product of 3 factors

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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?