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Subtract. Write your answer in scientific notation. $\newline$ $(9.1 \times 10^7) - (2 \times 10^7)$ $\newline$ Choices: $\newline$ (A) $7.1 \times 10^7$ $\newline$ (B) $2.8 \times 10^7$ $\newline$ (C) $5.5 \times 10^7$ $\newline$ (D) $6.3 \times 10^7$

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Add and subtract numbers written in scientific notation

Full solution

Q. Subtract. Write your answer in scientific notation.

\newline

(9.1 \times 10^7) - (2 \times 10^7)

\newline

Choices:

\newline

(A)

7.1 \times 10^7

\newline

(B)

2.8 \times 10^7

\newline

(C)

5.5 \times 10^7

\newline

(D)

6.3 \times 10^7

Subtraction in Scientific Notation: We have the following subtraction problem in scientific notation: $\newline$ $(9.1 \times 10^7) - (2 \times 10^7)$ $\newline$ Since the powers of $10$ are the same, we can directly subtract the coefficients. $\newline$ What is $9.1 - 2$ ? $\newline$ $9.1 - 2 = 7.1$
Convert to Scientific Notation: Write the answer in scientific notation. $\newline$ Substitute $7.1$ for the coefficient and keep the power of $10$ the same, which is $7$ . $\newline$ Scientific notation: $7.1 \times 10^7$
Equivalent Expression: Choose the equivalent expression for $(9.1 \times 10^7) - (2 \times 10^7)$ . $(9.1 \times 10^7) - (2 \times 10^7) = 7.1 \times 10^7$ $(9.1 \times 10^7) - (2 \times 10^7)$ is equivalent to $7.1 \times 10^7$ .

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