Which numbers are greater than 3 × 10^−7?

Choose all answers that are correct.

A.
9 × 10^−9

B.
2 × 10^−5

C.
6 × 10^−7

D.
5 × 10^−8

E.
2 × 10^−7

Question

Which numbers are greater than 3 × 10^−7?
 
Choose all answers that are correct.
 
 A.
9 × 10^−9
 
 B.
2 × 10^−5
 
 C.
6 × 10^−7
 
 D.
5 × 10^−8
 
 E.
2 × 10^−7

mathstudent55 · Answer

A number whose exponent of 10 is less than -7 is smaller than the given number.
Which choices does this eliminate?

anonymous · Answer

so its a b d @mathstudent55

mathstudent55 · Answer

Remember you need to choose all correct answers, not just one.

-9 and -8 are both less than -7.
That means choices A and D are eliminated.

Since in choice B, the exponent is -5, which is larger than -7, B is a correct choice.

Now we need to deal with C and E.
Both choices C and E have the same exponent as the given number, -7.
Now you need to look at the first part of each number.
The given number has a 3 in it.
C has a 6, so it's greater.
E has a 2, so it's smaller.

The final answer is choices B and C.