Sequences and Sigma Notation

What is the rule for the n^th term given  60, 55, 50, 45, ...

• a_n= 60n - 5

• a_n= -5n + 55

• a_n= -5n + 65

• a_n= 5n + 55

Write 1 + 2 + 3 + ... + 10 using sigma notation

Write 1 + 4 + 9 + ... + 49

using sigma notation

Write the formula for the n^th term:  3.5, 7, 14, 28, 56

• a_n = 3.5(0.5)^n-1

• a_n = 2n + 1.5

• a_n = 3.5n

• a_n = 3.5(2)^n-1

Write the formula for the n^th term of the sequence:  5, 11, 17, 23, … ,35

• t_n = 6n – 1 

• t_n = 5(6)^n-1

• t_n = 6n + 5

• t_n = 6n - 7

Rewrite the series below in sigma notation:

Rewrite the series below in sigma notation:

Find the common ratio:  a₁ = 4 and a₄ = 256

• 84

• 64

• 4

• 8