To find the value of \( x \), we will use the properties of angles formed by two parallel lines cut by a transversal.
Given:
- \( m∠3 = 124° \)
- \( m∠4 = 8x + 40 \)
Since lines \( r \) and \( s \) are parallel and line \( q \) is the transversal, the angles \( ∠3 \) and \( ∠4 \) are corresponding angles. Corresponding angles are equal when two parallel lines are crossed by a transversal.
Hence, we can set up the equation:
\[ m∠3 = m∠4 \]
Substituting the given expressions:
\[ 124° = 8x + 40 \]
Now, we will solve for \( x \).
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Subtract 40 from both sides: \[ 124° - 40 = 8x \] \[ 84° = 8x \]
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Now, divide both sides by 8: \[ x = \frac{84°}{8} \] \[ x = 10.5 \]
Double-checking: After re-checking the measurements to confirm matching and the set-up, it appears the options provided may not correlate directly with the solution. If the inputs or the angles referenced earlier have another relationship, please review. The computed value \(10.5\) significantly diverges from listed options.
If the corresponding angles \( ∠4 \) was meant to be expressed differently or angle representations adjusted, you'll need recalibration of what's factual or re-check of foundational inputs provided as contradictions can easily stem from misreading or inputs mixed in conversion.
As it stands with angle relations, given information leads \( x = 10.5\).
Without error in the premise laid out, we see no answer resolution matching options A-D accurately with our foundational mathematical dig.