Not sure how to solve. Please help.

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

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.

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.