Range of y=sqrt(10-3x) algebraically

How do you find the area of a triangle

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?

Ill mark the brainliest if you me with the these three questions 7,8,9