The directrix of a parabola is the line y=7. The focus of the parabola is (2,3). What is the equation of the parabola?

What is the missing step in this proof ?

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?