What is the Vertex?

y = x² - 8x-1

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

What are “like terms”? why can we only add like terms?

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.