You can see that two consecutive terms always differ by 20.
In other words, you generate the next term in the sequence by adding 20 to the previous one.
This implies the following structure:

In particular, this implies


So, the answer to the equation is n=-15
Answer:
Step-by-step explanation:
A=2i+3j+4k
B=i-2j+3k
Sum of the vectors:
A + B = 2i+3j+4k + i-2j+3k = 3i + j + 7k
Direction of the sum of the vectors:
