We need to find the n term formula:
The given sequence represents an arithmetic sequence and it follows the next form:
Where a represents the first term, in this case, a= -31
n is the term of the sequence
And d is the constant:
Let's find the constant
a1 to a2 =
-32 to -132, then, -32 needs -100 units bo equal to -132.
Now, -132 need -100 units to be equal to -232.
-232 needs -100 units to be equal to -332
Therefore, the constant d is equal to -100, d=-100
Replacing these values:
Then:
With this n formula, we can replace n=40, then, we will find a40:
Therefore:
