The area of the United States is 3,794,100 square miles. Which is the best estimation of this area?
Responses
A. 3 x 10^6
B. 3 x 10^7
C. 4 x 10^6
D. 4 x 10^7
E. 4 x 10^8
Responses
A. 3 x 10^6
B. 3 x 10^7
C. 4 x 10^6
D. 4 x 10^7
E. 4 x 10^8