Answer:
-33 or 33
Step-by-step explanation:
The seventh term of an AP is written as:

The eleventh term of an AP is written as:

If the 7th term is 11 times the 11th term, then;

Expand to get:





We must have a=-52 and d=5
Or
a=52 and d=-5
For the first case, the 18th term is :

For the second case,

10 to the negative sixth equals 1/60, and then times 4 equals 4/60 or 1/15
Answer:
the answer is 10
Step-by-step explanation:
hope this helps
I hope that this helps you.
I don't know how to solve 11 but I guess I can solve 12 so I think those are the answers:
12.
(4, 53)
(5, 85)