Question

Find an equation for the nth term of the arithmetic sequence.

8, 6, 4, 2, ...

Answer 1

An=a1+ (n-1)d
Do you know this formula?

Answer 2

@jim766 yes but I don't understand it

Answer 3

A1 is the first term
D is the common difference
Common difference is the number you add each time to find the next number

Answer 4

So what is the common difference?

Answer 5

@jim766 -2

Answer 6

Right,
What is the first term?

Answer 7

What is the first number in the sequence?

Answer 8

@jim766 8

Answer 9

An = 8 + ( n - 1) (-2)

Answer 10

Now distribute the -2

Answer 11

@jim766 An = 8+ -2n + 2 = 10 + -2n

Answer 12

Right, nice job!