Answer:
12+8n
Step-by-step explanation:
This is sequence and series
Using the formula,a+(n-1)d
a means the first number
n means the number of progression
d means the difference
a=20
n=?
d=8
Apply the formula
=20+(n-1)8
=20+(8n-8)
=20+8n-8
=20-8+8n
=12+8n
The arithmetic equation is 12+8n
