Question

If a1= 7 and r=3, find a4

Answer 1

Answer:

a4 = 189

Step-by-step explanation:

Geometric sequence:

In a geometric sequence, the quotient r between consecutive terms is always the same.

The nth term of the sequence is given by:

$a_n = a_1*r^{n-1}$

In which $a_1$ is the first term.

In this question:

$a_1 = 7, r = 3$

The fourth term is:

$a_4 = 7*3^3 = 189$

So

a4 = 189