You mailed 3 identical letters weighing more than 1 oz each. mailing each letter cost $.37 for the first ounce, plus $.23 for each additional ounce. each letter required $1.29 yd postage. how much did each letter weigh, to the nearest ounce?

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 x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.