What is the equation of the parabola in vertex form with vertex (2,-4) and directrix y=-6

Step-by-step explanation:

The directrix y=-6 is parallel to the x axes, so parabola has equation of the form

where is the vertex of parabola and p is parabola's parameter.

By the definition, is the distance from the vertex to the directrix, so

Hence, the equation of parabola is

See attached diagram for the graph of parabola and its directrix.

In vertex form this equation is

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart