### Home > PC3 > Chapter 4 > Lesson 4.2.3 > Problem4-95

4-95.

Express $2+2.5+3+3.5+\dots+9.5$ using sigma notation. Do not calculate the sum.

The terms in this series are linear. The first term is $2$, the second term is $2.5$, etc. Think about how you could write the equation of a line passing through the points $(1,2)$ and $(2,2.5)$.