Answer: 15.9
Step-by-step explanation:
Answer:

∠CBA=(7x+6)°
∠EBD=(9x-24)°

∠CBA=∠EBD (vertically opposite angles)
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I'm sorry I can't help you if it's not in English
22000
The number that's being added in the sequence increases by 2x.
250 * 2 = 500, which is added to 18500 to equal 19000.
500 * 2 = 1000, which is added to 19000 to equal 20000.
1000 * 2 = 2000, which added to 20000 equals 22000.