Pls help and hurry it’s timed

Which of the following are parts of a sphere

Use set buikder notation to represent the following set: {, -2, -1, 0}

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?