The 1st, 4th, and 7th terms make an arithmetic sequence of their own. The 4th term is the average of the 1st and 7th, so ...
(1st +7th)/2 = 4th
1st + 7th = 2×4th
1st = 2×4th - 7th
The first term is ...
2*141 - 132 = 150
You should know how to ............
Answer d is not the correct answer for sure
Answer:
the last one or the second, sorry if you get it wrong also can you like and, also can you give me brainly!!
Step-by-step explanation: