Question

Which is the first negative term in this sequence? 21, 19, 17 . . .

7th term

8th term

9th term

12th term

Answer 1

what do you do each time to get to the next term ?

Answer 2

go down 2

Answer 3

yes, you subtract 2.

Answer 4

Now, every term (whether positive or negative) is going to be ODD.

Agree with this?

Answer 5

12th term

Answer 6

did you think of 12 when you first came cause you started answering pretty fast

Answer 7

or did you just knew you could answer this answer lol

Answer 8

12th term?
\(\large\color{black}{ \displaystyle -1=21+(-2)(n-1) }\)
\(\large\color{black}{ \displaystyle -1=21-2n+2 }\)
\(\large\color{black}{ \displaystyle -3=21-2n }\)
\(\large\color{black}{ \displaystyle -24=-2n }\)
\(\large\color{black}{ \displaystyle n=12 }\)

Answer 9

yes, 12th

Answer 10

We used \(\large\color{black}{ \displaystyle a_n=a_1+d(n-1) }\)

Answer 11

and here we answered the question "whichTH term in the sequence is -1 ? "

Answer 12

Why -1? because it is the first negative term.

Answer 13

again, correct the first negative term is the 12th...

Answer 14

thx