A(1) = -11 a(n) = a(n − 1). 10 What is the 4th term in the sequence?

Answer 1

Arithmetic Sequence

a(1) = -11, a(n) = a(n - 1) + 10

a(2) = -11 + 10 = -1

a(3) = -1 + 10 = 9

a(4) = 9 + 10 = 19

The 4th term of the sequence is 19.

Answer 2

A(1) = -11

Geometric sequence

a(n) = a(n-1).10

A(2) = A(1).10 = -11.10 = -110

A(3) = A(2).10 = -110.10= -1100

A(4) = A(3).10 = -1100.10 = -11000