What does the line y=k-1/4a represent in y=a(x-h)^2+k, the standard form of equation for a parabola?

The line y=k-1/4a represent in y=a(x-h)^2+k is:

                                   Directrix.              

Directrix of a parabola--

A directrix is a line which is perpendicular to the axis of symmetry of a parabola and it does not touch the parabola.

Also, for the standard equation of the parabola i.e.

The equation of directrix of a parabola is given by:

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step-by-step explanation:

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour