The differentiable functions x and y are related by the following equation: y^2=x^2-5 Also, dy/dt=2.1. Find dx/dt when y=-2y and x>0

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)