Approximately how many times greater is 1.2*103 than 4*10-1?

3

30

300

3000

1.2 * 10^3 means shift the decimal 3 places right. 1200 which is 1200

4 * 10^-1 can be handled 2 ways 10 to the minus 1 in the denominator

becomes 10^1 in the numerator. notice the sign change on the 10 when you

shift it ... it becomes plus

1200 * 10 ^ 1

12000

now you are still left with 4 in the denominator

12000/4 = 3000

So your answer would be D. 3000