Question

Which of the following choices is the simple formula for the nth term of the following arithmetic sequence?

5, 1, -3, -7, -11, ...

A. -4n + 1
B. 5n + 4
C. -4n + 9
D. 4n + 9
E. 4n + 1

Answer 1

a=5 d=-11-(-7)=-4
n th term=a+(n-1)d solve

Answer 2

I think that the cnstant of such sequence is \(d=-4\), so the n-th term is given by the subsequent formula:
\[\begin{gathered}
{a_n} = {a_1} + \left( {n - 1} \right)\left( { - 4} \right) = \hfill \\
\hfill \\
= 5 + \left( {n - 1} \right)\left( { - 4} \right) = ...? \hfill \\
\end{gathered} \]
namely, the same answer of @Er.Mohd.AMIR

Answer 3

I agree with @Er.Mohd.AMIR and @Michele_Laino

Answer 4

okay so it would be 4n+9

Answer 5

5-4n+4 solve

Answer 6

it would be -4n+1

Answer 7

-4n+9

Answer 8

i mean 9 right

Answer 9

it hoguht the 5 was a negitive at first lol

Answer 10

ok

Answer 11

ty