Arithmetic Sequence _ Explicit Formula

What is the explicit formula for the sequence?

6, -14, -34, -54, ....

• $a_n=6\ +\ -18\left(n\ +1\right)$

• $a_n=6\ +\ -20\left(n-1\right)$

• $a_n=6\ +\ 20\left(n-1\right)$

• $a_n=\ 6\ +\ 18\left(n\ -1\right)\$

Tags

CCSS.HSF.BF.A.2

What is the explicit formula?

-13, -213, -413, -613, ...

• $a_n\ =\ -214\ +\ 201\left(n-1\right)$

• $a_n=-13\ +\ -201\left(n-1\right)$

• $a_n=-214\ +\ -201\left(n-1\right)$

• $a_n=-13\ +\ -200\left(n-1\right)$

Tags

CCSS.HSF.BF.A.2

What is the explicit formula?

5, -3, -11, -19, ...

•  $a_n\ =\ 5\ +\ -6\left(n-1\right)$ 

•  $a_n=5\ +\ -8\left(n-1\right)$ 

•  $a_n=5\ +\ 6\left(n-1\right)$ 

•  $a_n=11\ +\ 6\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula?

20, -80, -180, -280, ...

•  $a_n\ =\ 20\ +\ -100\left(n-1\right)$ 

•  $a_n=20\ +\ -98\left(n-1\right)$ 

•  $a_n=20\ +\ -99\left(n-1\right)$ 

•  $a_n=20\ +\ -96\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula?

2, 11, 20, 29, ...

•  $a_n\ =\ -5+\ -7\left(n-1\right)$ 

•  $a_n=2+\ -7\left(n-1\right)$ 

•  $a_n=2\ +\ 7\left(n-1\right)$ 

•  $a_n=2\ +\ 9\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula? 

21, 25, 29, 33, ...

•  $a_n\ =\ 20+\ 4\left(n-1\right)$ 

•  $a_n=20+\ 6\left(n-1\right)$ 

•  $a_n=21\ +\ 4\left(n-1\right)$ 

•  $a_n=22\ +\ 4\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula? 

-12, -22, -32, -42, ...

•  $a_n\ =\ -14+\ 8\left(n-1\right)$ 

•  $a_n=-14+\ -8\left(n-1\right)$ 

•  $a_n=-14\ +\ -10\left(n-1\right)$ 

•  $a_n=-12\ +\ -10\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula? 

11, -9, -29, -49, ......

•  $a_n\ =\ 11+\ -20\left(n-1\right)$ 

•  $a_n=12+\ 20\left(n-1\right)$ 

•  $a_n=13+\ 20\left(n-1\right)$ 

•  $a_n=13\ +\ -20\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula? 

25, 125, 225, 325, ...

•  $a_n\ =\ 125+\ 100\left(n-1\right)$ 

•  $a_n=223+\ 100\left(n-1\right)$ 

•  $a_n=123+\ 100\left(n-1\right)$ 

•  $a_n=25\ +\ 100\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2

What is the explicit formula? 

-17, 3, 23, 43, ....

•  $a_n\ =\ 21+\ 20\left(n-1\right)$ 

•  $a_n=20+\ -17\left(n-1\right)$ 

•  $a_n=-17+\ 20\left(n-1\right)$ 

•  $a_n=23\ +\ 3\left(n-1\right)$ 

Tags

CCSS.HSF.BF.A.2