Let us draw a picture to make the things more clear.
Attached is the image.
We have been given that

Therefore, we have

Now, in triangle bcd, we have

Now, in triangle acb, we have

Thus, ad is 15 cm.
Answer: 18 units
Step-by-step explanation:
The answer to ur equation is -1.5
356 days in a year / 7 days in a week = 50.8 weeks in a year
50.8 weeks in a year / 6 weeks = 8.48 payments
$156 x 8.48 payments = $1322.88 per year