Compare 4 x 10^6 and 2 x 10^7. a) 2 x 10^7 is 7 times larger than 4 x 10^6 b) 2 x 10^7 is 6 times larger than 4 x 10^6 c) 2 x 10^7 is 5 times larger than 4 x 10^6 d) 2 x 10^7 is 3 times larger than 4 x 10^6