7. laser printer and other non-impact printers print much faster than impact printers. the print is also clearer. the other ones are noisy and are best for printing documents with just charters on them. also ink jet printers are non-impact and spray the paint as opposed to the impact printers which prints out a series of lines.

8. Storage devices can work as both an input and output devise. For example tape drives, they can write data onto and read data off of a magnetic strip on the tape. these devises are also called secondary devises, a primary device is a ROM.

9. sequential access memory can only access the memory in the order in which it was recorded. it can retrieve information in the middle of the recording without going thru the whole tape. while the RAM can. the RAM is used in everyday computing while we use sequential memory is used for backing up data or other operations that aren't time consuming.