PLEASE HELP ME FOR 30 POINT

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.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?