Which equation should you solve to find x?

The graph of fx shown below has the same shape as the graph of gx = 3x^2 but is shifted down 2 units

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?

Find the measurement of angle b in the following triangle