How many inches are in 12 feet

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.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second