Answer question 4, 5, 6 pls

On a architect's drawing of a house, 1 inche representa 1.5

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

Which of the following is the true for f(x) = 5cos