Question

what is the difference written in scientific notation? 0.00067 - 2.3×10^(-5) 6.47×10^(-5) 4.4×10^(-5) 6.47×10^(-4) 4.4×10^(1)

Explanation:

Step1: Convert 0.00067 to scientific - notation

$0.00067 = 6.7\times10^{-4}$

Step2: Rewrite the subtraction with both numbers in scientific - notation

$6.7\times10^{-4}-2.3\times10^{-5}$

Step3: Make the exponents the same

$6.7\times10^{-4}=67\times10^{-5}$, so the expression becomes $67\times10^{-5}-2.3\times10^{-5}$

Step4: Subtract the coefficients

$(67 - 2.3)\times10^{-5}=64.7\times10^{-5}$

Step5: Convert to proper scientific - notation

$64.7\times10^{-5}=6.47\times10^{-4}$

Answer:

$6.47\times10^{-4}$