A5 The initial value of the function $f$ with the rule $f(x)=-\frac{1}{2} \cdot 5^{x}+4$ is:
(A) 4
(B) 5
(C) 0
(D) $-\frac{1}{2}$
(E) $\frac{7}{2}$
A5. We calculate $f(0)=-\frac{1}{2} \cdot 5^{0}+4=-\frac{1}{2}+4=\frac{7}{2}$.