To solve the compound inequality \( 5 \leq y + 20 < 16 \), we can break it down into two parts.
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Solve the left part: \[ 5 \leq y + 20 \] Subtract 20 from both sides: \[ 5 - 20 \leq y \] \[ -15 \leq y \] This can also be written as: \[ y \geq -15 \]
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Solve the right part: \[ y + 20 < 16 \] Subtract 20 from both sides: \[ y < 16 - 20 \] \[ y < -4 \]
Now we can combine the inequalities: \[ -15 \leq y < -4 \]
Thus, the final answer as a compound inequality is: \[ -15 \leq y < -4 \]