Answer:
3
Step-by-step explanation:
Slope is 2. if you use rise over run, you get 4 over 2, which is equal to 2.
If the polynomial in the numerator is a higher degree than the denominator , there is no horizontal asymptote
For an exponential function the y-intercept is the "initial value" (not the common ratio).

will always be 2. if that's what you need
note that

because anything to the power of zero equals 0 (mathematically it's deciding something by itself)