Find the perimeter of ABF

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

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.

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75