Jack is four years younger than Mary. Mario is 6 less than twice the age of Mary. The sum of their age is 22. What is Jack's age?

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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?