short answer

a. 
         The technological inventions of the Egyptians were the sail boat, pyramids, and the calendar. The sail boat was used a transportation around to fish or collect fresh water and it was also a way for the Egyptians to have fun. The pyramids were made to keep the bodies of pharaohs, that were mummified, and to preserve their body for the afterlife. Finally, the Egyptians invented the calendar, with 365 days, as a way to make better sense of the seasonal cycles and as a way to keep track of their days.

b.  
         Three important features of the pyramids were that they were made to honor the pharaoh and when he, or she, died they would keep their body in the pyramid to preserve it for the after life. Second, the chambers inside the pyramid that would lead to different rooms where the pharaoh was kept. Finally, the treasures and the interior paintings were to honor the gods and to tell stories that depicted humans and gods.