A parabola opening up or down has vertex (0,0) and passes through (2, -1). Write its equation in vertex form.
Simplify any fractions.

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?

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years