Asquare and a rectangle have equal areas. the rectangle is 64 cm by 81 cm. what is the perimeter of the square?

Since the square and the rectangle has equal areas, then all you have to do is solve the perimeter of the rectangle. 64+64+81+81, or you can do, 64x2+81x2. If you solve those, then you will get the answer of what is the perimeter of the square. 

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction