Question

HELP Will Fan and Medal... Thanks in Advance <8th Grade Math>
Which shows the expression below in simplified form?
(6.4 × 10^-4) - (3.8 × 10^-5)
A. 2.6 × 10^-4
B. 2.6 × 10^-5
C. 6.02 × 10^-4
D. 6.02 × 10^-5

Answer 1

@hysusonic

Answer 2

@barakahcharm

Answer 3

I figured it was either A or B. If you subtract 6.4 and 3.8 you get 2.6. The only thing that gets me is what exponent do I put?

Answer 4

@Willie579

Answer 5

(6.4 × 10-4) - (3.8 × 10-5) = 27.

Answer 6

\[6.4 × 10^{-4} - 3.8 × 10^{-5} = 6.4 × 10^{-4} - 0.38 × 10^{-4}\]

Answer 7

Well, I was trying to figure it out. :P

Answer 8

\[6.4 × 10^{-4} - 0.38 × 10^{-4} = 6.02 × 10^{-4}\]

Answer 9

try another one:)

Answer 10

@lochana can you explain that? I have another one just like it and I have no clue how to do it.

Answer 11

Also I had to make an edit to the question. ^ means the following number is an Exponent.

Answer 12

yes.
if we have things like
\[a.10^b \ , b.10^b\]
you can sum them up such that
\[(a+b).10^b\]

Answer 13

notice exponent of 10 should be same to do that.

Answer 14

Ok. Can you help me with the second one? I'll make another thread if so.

Answer 15

sure

Answer 16

wait to the question is answered?