Which of the following is greater than 4.3x10^9

Question

A. 2.1x10^9
B. 3.2x10^9
C. 5.3x10^9***
D. 7.4x10^8
Which of the following is less than 6.5x10^-5
A. 1.4x10^-3***
B. 2.5x10^-4
C. 7.8x10^-5
D. 4.6x10^-6

According to the 2010 census the population of Nebraska was 1.8x10^6 people. Which state had a smaller population?
A. California: 3.7x10^7
B. Rhode island: 1.1x10^6***
C. Texas: 2.5x10^7
D. Missouri: 6x10^6

Which number is greater than 5.5x10^-7 and less than 5.5x10^7

A. 1.8x10^-12
B. 6.7x10^8
C. 5.2x10^3***
D. 3.9 x 10^-8

Answer 1

first answer ---- correct
2nd answer ---- wrong, to have a number less than 6.5x10^-5,
look for an exponent less than -5, I see 4.6x10^-6 , the correct answer.

3rd answer ---- correct

4th answer ---- I see 2 numbers which are > than 5.5x10^-7
namely 6.7x10^8 and 5.2x10^3 , notice their exponents are greater than the exponent of 5.5x10^-7
I also see 2 numbers which are < 5.5x10^-7
namely 1.8x10^-12 and 3.9 x 10^-8 , notice their exponents are less than the exponents of 5.5x10^-7

Answer 2

1 c
2 d
3c
4c
am i correct?

Answer 3

You should have numbered your questions
In #3 you had picked Rhode Island, which I said was correct, and now you pick Texas. ???

Answer 4

srry i meant rhode island
now r my answers correct?