Find the balance in the account after the given period $500 principal earning 4% compound quarterly after 6 years

What is sin 7x/4 ? i need on this urgent trig

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.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items