What’s the product of 0.056 • (-0.004)??

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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 one is the correct answer, and why?