Answer:

Step-by-step explanation:
The first step to solving this problem is verifying if this sequence is an arithmetic sequence or a geometric sequence.
This sequence is arithmetic if:

We have that:




This is not an arithmetic sequence.
This sequence is geometric if:




This is a geometric sequence, in which:
The first term is 40, so 
The common ratio is
, so
.
We have that:

The 10th term is
. So:



Simplifying by 4, we have:

Answer:
Hi! The nswer to your question is m = 1
Step-by-step explanation:
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Answer:
I don't know. truncating your text book
Answer: 40
Step-by-step explanation:
The answer is 84 because 21 times 4 equals 84