How do you use a number line to multiply two digit numbers by 20

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?

What can you determine about the solutions of this system

What is the solution set of the quadratic inequality x^2-5< or equal to 0