The circumference of the Earth is approximately 25,000 miles. What is this number expressed in scientific notation?

A) 2.5 x 10^4

B) 2.5 x 10^3

C) 25 x 10^3

D) 2.5 x 10^4

The circumference of the Earth is approximately 25,000 miles. What is this number expressed in scientific notation?

A) 2.5 x 10^4

B) 2.5 x 10^3

C) 25 x 10^3

D) 2.5 x 10^4