Question

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Explanation:

Step1: Analyze the given data

Allison's typing speed is 47 words per minute. We need to estimate the number of words she can type in half an hour (30 minutes). For estimation, we round 47 to the nearest ten, which is 50, and keep the time as 30 minutes.

Step2: Determine the expression

The formula for the number of words typed is \( \text{Typing Speed} \times \text{Time} \). So, substituting the estimated speed (50 words per minute) and time (30 minutes), the expression becomes \( 50\times30 \).

Answer:

D. \( 50\times30 \)