I'm confused with this problem and don't really get it. thx to anyone who helps! :)

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

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)