A5. The exponential function with the rule $f(x)=-2 \cdot 2^{3 x-1}+4$ has the initial value
(A) -2
(B) $\frac{2}{3}$
(C) 3
(D) 4
(E) None of the above answers is correct.
A5. The function reaches its initial value at $x=0$, so we have $f(0)=-2 \cdot 2^{3 \cdot 0-1}+4=-2 \cdot \frac{1}{2}+4=3$.