Questions

The Mayans were an ancient civilization located in what is known as Mesoamerica, a geographical region comprised of Mexico and parts of Central America. They were extremely adept in matters of mathematics, astronomy, and art, and architecture.

The Mayan pyramids and temples were built with bricks and covered with limestone.

Convex mirror is used as rear view mirror in vehicles. Because the image is smaller, more image can fit onto the mirror, so a convex mirror provides for a larger field of view than a plane mirror. This is why they are useful.

Physical signs of stress include Frequent colds and infections, aches, pains and tense muscles, stomach upset, loss of sexual desire, etc...

In communication satellite, multiple repeaters are known as Transponders.

The Sales Order is a confirmation document sent to the customers before delivering the goods or services. 

Sales Order (SO) can be created once the quote is accepted by your prospective customer and the Purchase Order (PO) is sent by the customer for further processing.