Formal Formative: Arithmetic and Geometric Sequence and Series

Select all arithmetic sequences.

• 20, 40, 80, 160, 320,...

• 12, 6, 0, -6, -12,....

• 20, 22.5, 25, 27.5, 30, ...

• 3, -6, 12, -24, 48, ...

Which pattern of numbers represents a geometric sequence? select the correct answer

• 2, 4, 6, 8, 10..

• $200,40,8,\frac{8}{5},\frac{8}{25},...$

• 3, 9, 15, 21, 27,...

• 25, 15, 5, -5, -15, ...

Find the next 3 terms in the sequence -5, -3, -1,

______, _______ , ________,

select the correct answer!

• -1, -3, -5

• 1, 3, 5

• 2, 5, 7

• 3, 5, 8

Find the next 3 terms in the sequence

x + 6, x + 2, x - 2, ________, _______, ________

• x + 4, x + 8, x + 12

• x - 4, x - 8, x - 12

• x - 6, x- 8, x - 14

• x - 6, x - 10, x - 14

What are the next 2 terms of the sequence

50, 10, 2 ,_____, ______?

• $\frac{2}{5},\frac{2}{25}$

• $-36,\ -76$

• $\frac{2}{5},\frac{1}{5}$

• $8,14$

Find the 37th term for the sequence 17, 26, 35, ...Show your work on paper. Type your answer in the blank. Don't use spaces

What is the 6^th term for the sequence given

-2, -14, -98...

Show your work on paper. Type your answer in blank, no spaces.

Find the first term in the arithmetic sequence for which $a_{20}=120;\ d=4$  Show your work on paper! Then type your answer in the blank! no spaces

 $a_n=62;\ a_1=5;d\ =3$  

Find n for the arithmetic sequence using the information above! Show your work on paper then type your answer in blank. no spaces

 $a_1=-12;\ a_8=-54$  

Find d for the arithmetic sequence given the information above. Show your work on paper then select the correct answer!

• d = 8

• d = 5

• d = -6

• d = 7