Question

The value due regard to significant figure $4.0\times {10}^{-4}-2.5\times {10}^{-6}$

• A. $4.0\times {10}^{-4}$
• B. $3.975\times {10}^{-4}$
• C. $3.9\times {10}^{-4}$
• D. none of the above

Answer 1

Answer: (B)

$3.975\times {10}^{-4}$

The value of this case is,

$4.0\times {10}^{-4}-2.5\times {10}^{-6}$

$=3.975\times {10}^{-4}$.