Arithmetic Sequence Basics

Which is the correct arithmetic sequence formula for: 55, 35, 15, -5,....

• $a_n=55\ +20\left(n-1\right)$

Explain how to find the formula for an arithmetic sequence:

Find the 32nd term of this sequence.
34, 37, 40, 43, ...

• 32

• 64

• 127

• 356

Find the 25th term of the sequence if a₁ = 5 and d = 0.5

• 18

• 17

• 15

• 14

Find the nth term of the following sequence

7, 9, 11, 13, 15

Calculate the sum of the 100th term and 200th term of the sequence 6, 15, 24, 33, ... ...

Find the values of a in the following arithmetic sequence

5, 9, a, 17, 21

Find the values of a in the following arithmetic sequence

1, 6, a, 16, 21

Find the nth term of the following sequence

• n + 6

• n - 1

• 6n - 1

• 6n + 1

Find the nth term of the following sequence

-1, 4, 9, 14, 19