Can someone please help me? This is mortgage payments lesson in Trigonometry.

Answer:
$12,000
Step-by-step explanation:
Since the answer to problem 2 is $8,000 and it is 2/3 of 30 years, all you have to do is find half of $8,000, which is $4,000 and add them together which makes $12,000 and it pays off for 30 years.