Find the vertex of the parabola f(x)=x2-6x+13

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?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Which statements are true about additional information for proving that the triangles are congruent check all that apply