Answer:

• x = 2

Step-by-step explanation:

Vertical angles are equal as per definition.

• ∠E and ∠F are vertical angles
• m∠E = 9x+12 and m∠F = 3x+24
• x = ?

Solution

• 9x+12 = 3x+24
• 9x – 3x = 24 – 12
• 6x = 12
• x = 2