What is the product in scientific notation?

Question

(2.3 x 10-4)(5 x 10-11)

Answer 1

(2.3x10^-4)(5x10^-11)=(2.3x5)(10^-4x10^-11)

(11.5)(10^-15)=(1.15x10)(10^-15)=(1.15)(10x10^-15)

(1.15)(10^-14)