Help due today! I have no idea how to do this.

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

Acircle has a circumference of 28.36 units what is the diameter of the circle

Which expression converts 45 degree to radians