You’ve got the correct answer (which is the first one) hope this helps
Answer:
72.3
Step-by-step explanation:
Given that:
The arithmetic sequence:

The first term of the sequence
= 3 since k = 0
i.e (3 + 0.26(0)) = 3
The last term of the sequence
= 6.64
i.e (3+ 0.26(14)
= (3 + 3.64)
= 6.64
Total no of terms = 15 i.e from 0 to 14
∴
The partial sum of the arithmetic sequence = 

= 72.3
X° = 90°-29°
= 61°
y°= 90°- 61°
= 29°
find y and x right?
I would say D the other answers seem wrong