13-1

This week in advanced math we did not learn anything new. We reviewed for our chapter 13 test which we took Friday. We also received our chapter 7 and chapter 8 packets for our exam next week. So let’s do a little review of chapter 13. Section 13-1 is introducing sequences. Sequences are a list of numbers. There are two kinds of sequences, arithmetic and geometric. An arithmetic sequence is where the same number is added or subtracted each time. Geometric sequences are where the same number is multiplied or divided each time. Just like every other chapter there are formulas involved. Both arithmetic and geometric sequences have their own formulas:

Arithmetic - tn = t1 + (n-1) d
Geometric – tn = t1 = rn-1

Tn – the term

Examples:
Is the following sequences arithmetic, geometric, or neither?
3, 6, 9, 12, 15, 18, 21 – Arithmetic d = 3
5, 7, 10, 13, 16, 22, 24 – Neither random numbers
2, 8, 32, 128, 512, 2048 – Geometric d = 4