Let y = 2 sin (2x) and d^4y/dx^4 = ky, where k is a constant. What is the value of K?
O -2^5
O -2^4
O 2^4
O 2^5

This question is designed to be answered without a calculator.
If f(x) = 1-2e^-x/1-e^-x then f has horizontal asymptote(s) at y =
O 0 only
O 1 only.
O 1 and 2 only.
O 0.1, and 2 only