The local gym wants to expand the entire building by doubling the size. Find the perimeter of the entire rectangle

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

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?