To find \( f(3) \) for the function \( f(x) = 5x + 6 \), you need to substitute \( x \) with 3 in the function.
\[ f(3) = 5(3) + 6 \]
Now, calculate it step by step:
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First, multiply \( 5 \) by \( 3 \): \[ 5 \times 3 = 15 \]
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Then, add \( 6 \) to the result: \[ 15 + 6 = 21 \]
So, \( f(3) = 21 \).
The answer is: \[ f(3) = 21 \]