Question

Write an expression to describe the sequence. -19, -18, -17, -16, ...

Answer 1

an=n-20

Explanation:

c.d.=-18-(-19)=1

a1=-19

an=-19+(n-1)1=-19+n-1=n-20

Answer 2

x + 1

Explanation:

every time in the sequence one gets added to the number.