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laneuensgrett laneuensgrett
  • 03-02-2016
  • Mathematics
Answered

What is the sum of (1.3 × 10-7) and (-3.8 × 10-3)?

A2.5 × 10-10
B-2.5 × 10-4
C3.8 × 10-3
D-3.8 × 10-3

Verified Answer :

taskmasters
taskmasters taskmasters
  • 03-02-2016

1.3 x 10⁻⁷ + -3.9 x 10⁻³

1.3 x 10⁻⁷ = 0.00000013
-3.9 x 10⁻³ = -0.0039

-  0.00390000
+ 0.00000013   
 - 0.00389987 ⇒ -3.8 x 10⁻³  CHOICE D.

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