Question

question
evaluate. express your answer in scientific notation.
$7.8 \times 10^{-3} - 7.6 \times 10^{-4}$

Explanation:

Step1: Rewrite terms to same exponent

Convert $7.8 \times 10^{-3}$ to $78 \times 10^{-4}$

Step2: Subtract the coefficients

$78 \times 10^{-4} - 7.6 \times 10^{-4} = (78 - 7.6) \times 10^{-4} = 70.4 \times 10^{-4}$

Step3: Adjust to scientific notation

Rewrite $70.4 \times 10^{-4}$ as $7.04 \times 10^{-3}$

Answer:

$7.04 \times 10^{-3}$