To solve for \( x \) in the equation \( 21x + 1,998 = 2,243 \), we first isolate \( x \).
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Subtract 1,998 from both sides: \[ 21x = 2,243 - 1,998 \] \[ 21x = 245 \]
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Next, divide both sides by 21: \[ x = \frac{245}{21} \] \[ x \approx 11.67 \]
Since we need the best estimate for \( x \) from the given options:
- 1
- 10
- 1,000
- 100
The closest estimate to 11.67 is 10.
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