### Home > A2C > Chapter 3 > Lesson 3.2.3 > Problem 3-125

3-125.

Notice that the increase is not a constant number.

The sequence is arithmetic.*t*(*n*) = 9.1 + 1.2*n*

Notice the ratio.

Notice that each number is a perfect square.

Notice that the sequence's increase is constant.

Remember what 11 squared is.

The sequence is geometric.*t*(*n*) = 1.1^{n}