What is equivalent to 2 + 3n + 2 + 9n

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

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

W-16=-12 solve each one step equation plz