What happened today 30 years ago 03-30-16?

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?