How do you find the volume of a sphere and hemisphere?

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.

Which of the following circles have their centers on the x-axis? check all that apply.

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36