Acircle has a diameter of 26 cm. what is it's circumference?

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.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?