If f'(x) = -f(x) and f(1) = 1, what is f(x)? f(x) = e-x-1 Option 2 f(x) = e-x Option 4 f(x) = e¹-x Option 3 f(x) = 12e-2x+2 Option 1 [HINT: Observe what happens when you take the derivative of e^5x. Then get 1 point its second derivative. Then its third. Then its fourth; and lastly, the fifth. Which among the choices follow the pattern or is equal to the expression you got?] If y = enx, for any natural number n, what is dxn