To predict your total wages using the equation of the trend line \( y = 0.75x + 30 \), where \( x \) is the number of phones assembled:
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Plug in \( x = 100 \): \[ y = 0.75(100) + 30 \]
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Calculate \( 0.75 \times 100 \): \[ 0.75 \times 100 = 75 \]
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Now, add 30 to this amount: \[ y = 75 + 30 = 105 \]
Thus, your wages for assembling 100 phones in one day would be $105.00.