To analyze the situation described, we need to consider the depreciation of the laptop's value over time. Salman purchased the laptop for $1,599 and it retains 90% of its value every year.
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Y-Intercept: At year 0 (the time of purchase), the value of the laptop is $1,599, which would correspond to the point (0, 1599). The y-intercept mentioned as (0, 5) is not correct.
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Realistic Range: The value of the laptop decreases over the years but never goes below $0. Hence, the realistic range of the graph is from 0 to $1,599 (the initial value).
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Increasing Function: Since the value of the laptop decreases over time (it retains only 90% of its value each year), the function is a decreasing function, not an increasing function.
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Realistic Domain: The domain is the time period we are considering, which in this case is from 0 to 5 years after the purchase.
Based on this analysis, the correct key feature of the sketch should be:
The realistic range is from 0 to 1,599.