Question

1.Which of the following is greater than 4.3 x 10^9
A.2.1×10^9
B.3.2×10 ^9
C.5.3×10 ^9
D.7.4×10^8
My answer C

2. Which of the following is less than 6.5x10^-5
A. 1.4×10 ^-3
B. 2.5×10 ^-5
C. 7.8×10^-5
D. 4.6×10 ^-6
My answer A

According to the 2010 census, The population of Nebraska was 1.8×10^6 people which state had a smaller population
A. California 3.7×10^7
B. Rhode Island 1.1×10^6
C. Texas 2.5×10^7
D Missouri 6×10^6
My answer D

Which is greater
A.7.8×10^15
B.7.65×10^14
C.7.65×10^4
D.All equal
My answer A

Please check

Answer 1

#1 ok
#2 no. 10^-3 is greater than 10^-5
10^-6 is less than 10^-5

#3 nope. 16 > 1.8
#4 yes. A is greatest (not greater, which compares only 2 values)