Explicit Formulas for Arithmetic & Geometric Series

Find the explicit formula:
-3, -33, -63, -93, ...

• a_n = -3 - 30(n -1)
• a_n = -3 + 30(n -1)
• a_n = -30 - 3(n -1)
• a_n = -30 + 3(n -1)

Tags

CCSS.HSF.BF.A.2

Find the term named in the problem
14, 214, 414, 614, ... a₃₀

• 5724
• 5814
• 5784
• 5614

Tags

CCSS.HSF.BF.A.2

Given the sequence:

25, 21, 17, 13,...

Write the explicit equation that models the sequence.

• a_n = 4n + 29

• a_n = 25 +(-4)(n-1)

• a_n = -25 +(-4)(n-1)

• a_n = 4n + 25

Tags

CCSS.HSF.BF.A.2

Create the explicit formula for the sequence:
15, 9, 3, ...
Do not simplify

• a_n=15+(n-1)6
• a_n=21+(n-1)(-6)
• a_n=15+(n-1)(-6)
• a_n=9+(n-1)6

Tags

CCSS.HSF.BF.A.2

Find a₂₀ in the arithmetic sequence: 5, 12, 19, 26...

• 145
• 144
• 142
• 138

Tags

CCSS.HSF.BF.A.2