Is the amount of tax collected proportional to the cost of an item after tax has been added?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

What is not true about kl and mn? what is mn? (show your work)

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?