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What is the product written in scientific notation?

(1.4 x 10^3)(2.5 x 10^-6)

A. 3.9 x 10^-3

B. 3.9 x 10^-18

C. 3.5 x 10^-3

D. 3.5 x 10^-2

Question

CHECK MY ANSWER

What is the product written in scientific notation?

(1.4 x 10^3)(2.5 x 10^-6)
  
  A.  3.9 x 10^-3
   
  B.  3.9 x 10^-18

C.  3.5 x 10^-3

D.  3.5 x 10^-2 <<<<

anonymous · Answer

Nope You have the mantissa correct but the wrong exponent.

welshfella · Answer

multiply the first parts first - that is 1.4 * 2.5
then use the laws of indices to calculate the powers

10^a * 10^b  = 10^(a + b)

tkhunny · Answer

Please find a better way to format your questions.  We don't need all that white space.

Show how you got your answer!

anonymous · Answer

i would say yes your correct

thesmartone · Answer

Also copy and pasting fail, you lost all the powers to.

welshfella · Answer

10^3 * 10*-6 = 10^(3 - 6)

welshfella · Answer

* that should be 10^-6

welshfella · Answer

which option do you think is correct?