I do not know at all I am sorry
<u>Answer:</u>
-348
<u>Step-by-step explanation:</u>
We are given the following arithmetic sequence and we are to find the sum of its first 12 terms:
1, -4, -9, -14, . . .
For that, we will use the formula for the sum of the arithmetic mean:

We know the value of the first term (
) but we need to find the value of
. So we will use the following formula:



Substituting these values in the sum formula to get:

-348
The answer is 3, and then 3 again
Answer:
one solution
Step-by-step explanation:
9x+16=4x
16=4x-9x
16/-5=x
x=-3.2