12.3 & 12.4 review

 Determine if the sequence is arithmetic or geometric and then find the term.20th term:  -.125, .25, -.5, 1, ....

• 39366
• 73
• 65536
• -4.6

Determine if the sequence is arithmetic or geometric and the find the 8th term:  -3.2, -3.4, -3.6, -3.8, ....

• -4.6
• .25
• 5.75
• 2.39

What is the formula to find Arithmetic Sequence?

• a_n = a₁r^(n-1)
  a_n=a₁r^(n-1)
• a_n = a₁ + d(n-1)
• s_n = n(a₁ + a_n/2)
• s_n = a₁ (1 - rⁿ/1 - r)

3.  What is the formula to find Geometric Sequence?

• s_n = a₁(1 - rⁿ/1 - r)
  a_n=a₁r^(n-1)
• a_n=a₁ + d(n-1)
• a_n = a₁r^(n-1)
• s_n = n(a₁ + a_n/2)

What is the formula for the Arithmetic Series?

• a_n = a₁r^(n-1)
• s_n = a₁(1 - rⁿ/1 - r)
• s_n = n(a₁ + a_n/2)
• a_n=a₁ + d(n-1)

What is the formula for the Geometric Series?

• a_n=a₁ + d(n-1)
• a_n = a₁r^(n-1)
• s_n = a₁(1 - rⁿ/1 - r)
• s_n = n(a₁ + a_n/2)

Determine if the series is arithmetic or geometric and find the sum:  10 terms-2, -6, -18, -54, .....

• -59048
• 495
• 1130
• -189

A(n) ____________________ is an ordered set of numbers.

• sequence
• term
• explicit
• recursive

A __________________ sequence is a rule in which one or more previous terms are used to generate the next term.

• sequence
• recursive
• explicit
• term

A(n) _____________________ sequence defines the nth term of a sequence as a function of n.

• sequence
• term
• recursive
• explicit