(Arithmetic Sequences)
How do I find K, given the consecutive arithmetic terms:
1. k, 8, k+11
2. k+2, 2k+3, 17
The only example we were given is:
-1 - (k+5) = (2k-1) - (-1)
-1 - k - 5 = 2k - 1 +1
-k -6 = 2k
-6 = 3k
k = -2
... which doesn't really apply, particularly through the first one.
I managed to figure out one:
31, k, 13
31-13=18
18/2=9
31-9=22
--> purely based on logic though, I don't know how to do the previous two.
