A1. The value of the expression $4 \cdot 2^{2009}$ is
(A) $8^{2009}$
(B) $8^{2011}$
(C) $2^{2011}$
(D) $2^{2013}$
(E) $2^{4018}$
A1. The value of the expression $4 \cdot 2^{2009}$ is $2^{2} \cdot 2^{2009}=2^{2011}$.