Which equations have a rate of change equal to zero

Which is a true statement comparing the graphs of x^2/6^2-y^2/8^2 = 1 and x^2/8^2-y^2/6^2 the foci of both graphs are the same points. the lengths of both transverse axes are the same. the directrices of = 1 are horizontal while the directrices of = 1 are vertical. the vertices of = 1 are on the y-axis while the vertices of = 1 are on the x-axis.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

What is the volume of a cone with a height of 6 cm in the radius of 2 cm