The expression $(\sqrt{100}+\sqrt{9}) \times(\sqrt{100}-\sqrt{9})$ is equal to
(A) 91
(B) 19
(C) 9991
(D) 9919
(E) 10991
Simplifying, $(\sqrt{100}+\sqrt{9}) \times(\sqrt{100}-\sqrt{9})=(10+3) \times(10-3)=13 \times 7=91$.

ANSWER: (A)