Which of the following numbers can be added directly in exponential notation?

[Cute-Bunny]

Which of the following numbers can be added directly in exponential notation?

1. 3x10^-4

2. 600x10

3. 32.6x10^-3

4. 0.4x10^-4

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a. 1 and 2

c. 1 and 4

d. 2 and 4

b. 1and3

 

[chemisttree]

So what do you think?

 

[Cute-Bunny]

So what do you think?

a ! 1and2 I am not sure please help :(

 

[chemisttree]

What do you think is meant by "add directly" in this problem?

 

[Cute-Bunny]

im not sure what does it really mean but now I am looking at it i think it can be c, 1and4, because both of them have the same exponent (-4) !?

 

[chemisttree]

And right you are!

 

[Cute-Bunny]

And right you are!

Thank you so much for the help :)