Someone pls explain what o.99c+0.79a is and how to solve it!!!

Pick the description of a geometric object that best matches the real world object box for a deck of card

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

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?