Find the 20th term in the following arithmetic sequence 12,15,18,

Step-by-step explanation:

The formula for the arithmetic sequence is

, where

n is the position of the number you are looking for, a₁ is the first number in the sequenc, and d is the arithmetic difference (the difference between each number in the sequence).  For us:

n = 20,

a₁ = 12, and

d = 3.  ∴

our formula is this one:

and

and

so

a = 69

x= 149. 24+7=31. 180-31=149

your welcome

69.64%

step-by-step explanation: