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Add. Write your answer in scientific notation.\newline(5×105)+(3.9×105)(5 \times 10^5) + (3.9 \times 10^5)\newlineChoices:\newline(A) 7.2×10107.2 \times 10^{10}\newline(B) 8.9×1058.9 \times 10^5\newline(C) 7.2×1057.2 \times 10^5\newline(D) 8.9×10108.9 \times 10^{10}

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Q. Add. Write your answer in scientific notation.\newline(5×105)+(3.9×105)(5 \times 10^5) + (3.9 \times 10^5)\newlineChoices:\newline(A) 7.2×10107.2 \times 10^{10}\newline(B) 8.9×1058.9 \times 10^5\newline(C) 7.2×1057.2 \times 10^5\newline(D) 8.9×10108.9 \times 10^{10}
  1. Identify Coefficients: We have:\newline(5×105)+(3.9×105)(5 \times 10^5) + (3.9 \times 10^5)\newlineSince the powers of 1010 are the same, we can directly add the coefficients.\newlineWhat is 5+3.95 + 3.9?\newline5+3.9=8.95 + 3.9 = 8.9
  2. Convert to Scientific Notation: Write the answer in scientific notation.\newlineSubstitute 8.98.9 for the coefficient and 55 for the exponent in a×10ba \times 10^b.\newlineScientific notation: 8.9×1058.9 \times 10^5
  3. Find Equivalent Expression: Choose the equivalent expression for (5×105)+(3.9×105)(5 \times 10^5) + (3.9 \times 10^5).(5×105)+(3.9×105)=8.9×105(5 \times 10^5) + (3.9 \times 10^5) = 8.9 \times 10^5(5×105)+(3.9×105)(5 \times 10^5) + (3.9 \times 10^5) is equivalent to 8.9×1058.9 \times 10^5.

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