The expression \( d - 0.09d \) represents the value of Jessica's car after it has depreciated.
To simplify this expression:
\[ d - 0.09d = (1 - 0.09)d = 0.91d \]
This means that after the depreciation, the value of the car is \( 0.91d \).
Jessica's car depreciated by \( 9% \) during this time period, as indicated by the \( 0.09d \) term, which represents 9% of the original value \( d \).
An equivalent expression that represents this situation is \( 0.91d \).
To summarize:
- Jessica's car depreciated by 9%.
- An equivalent expression that represents the value of her car after depreciation is \( 0.91d \).
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