Arithmetic Sequences

Is the following sequence arithmetic?

2, 4, 8, 16, ....

• Yes

• No

Answer explanation

Arithmetic sequences should be increasing or decreasing by the same amount each term (adding or subtracting).

Is the following sequence arithmetic?

12, 5, -2, -9, ...

• Yes

• No

Answer explanation

Arithmetic sequences should be increasing or decreasing by the same amount each term (adding or subtracting).

Is the following sequence arithmetic?

1, 2, 3, 5, 8, .....

• Yes

• No

Answer explanation

Arithmetic sequences should be increasing or decreasing by the same amount each term (adding or subtracting).

Answer explanation

a1 = first term

d = common difference (how much the sequence is increasing or decreasing by).

Answer explanation

a1 = first term

d = common difference (how much the sequence is increasing or decreasing by).

Answer explanation

a1 = first term

d = common difference (how much the sequence is increasing or decreasing by).

Answer explanation

Plug in 12 for "n" in the equation.

Answer explanation

Plug in 22 for "n" in the equation.

Given the arithmetic sequence below, find the 15th term.

7, 11, 15, 19, ...

(Hint: write the equation first)

Answer explanation

Write the equation first.

Then plug in 15 for "n".

Given the arithmetic sequence below, find the 18th term.

80, 72, 64, 56, ...

(Hint: write the equation first)

Answer explanation

Write the equation first.

Then plug in 18 for "n".