1/2 (6a-5c) -1/3 (6a+4c) expand and simplify

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

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