### Home > A2C > Chapter 11 > Lesson 11.2.3 > Problem 11-74

11-74.

A sequence starts 24, 12, … Use that information to complete parts (a) and (b) below. Homework Help ✎

If the sequence is arithmetic:

Find

*t*(3).Find

*t*(*n*).What is the shape of its graph?

Which term is −624?

If the sequence is geometric:

Find

*t*(3).Find

*t*(*n*).What is the shape of its graph?

Which term is

Add (or subtract) the same amount again.

*t*(*n*) = 36 − 12*n*

Try graphing the sequence as a function.

Substitute −624 for *t*(*n*) and solve for *n*.

Multiply (or divide) by the same amount again.

Try graphing the sequence as a function.