To find the output of the function \( y = 3x + 6 \) when \( x = 0.3 \), you substitute \( 0.3 \) for \( x \):
\[ y = 3(0.3) + 6 \]
Calculating this step-by-step:
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Multiply \( 3 \) by \( 0.3 \): \[ 3 \times 0.3 = 0.9 \]
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Add \( 6 \): \[ 0.9 + 6 = 6.9 \]
Therefore, the output \( y \) when \( x = 0.3 \) is \( 6.9 \).
So, the correct response is:
6.9