To evaluate the expression \( df + f \) for \( d = 4 \) and \( f = 6.2 \), we can substitute the values of \( d \) and \( f \) into the expression:
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Calculate \( df \): \[ df = 4 \times 6.2 = 24.8 \]
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Now add \( f \) to \( df \): \[ df + f = 24.8 + 6.2 = 31.0 \]
Thus, the result of the expression \( df + f \) is \( 31.0 \).