How can you represent a relationship between two quantities?

What is the measure of angle afe? 79 81 91 99

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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.