When considering the cost of roofing materials, many people take into account just the shingle prices. This is incorrect, as a roof made just of roofing shingles will not work. You also need to consider all the accessories that are included in a complete roof system.
Business letters tend to have both the sender and receiver's address and the date at the top of the page and they begin with a polite salutation, such as dear Mr. and Mrs, followed by a blank line before the body or the content of the letter.
Certified Mail and Registered Mail are two USPS services that provide proof that an envelope or package reached its destination. The primary differences between Certified Mail and Registered Mail involve mail handling and the level of security used to protect mail from loss, damage or theft.