A natural law of decay is [tex]y= 2e^{-0.5x}[/tex] Draw a graph for this law for values of x from x = -4 to x = 4. From the graph:

A)Find the gradient of the curve at x = -3 and x = 0.5 by differentiation and by drawing a tangent to the curve.
B)Compare your two solutions for these gradients.