Chapter 6 - Exponential Functions and Sequences - 6.5 - Solving Exponential Equations - Exercises - Page 330: 63

The sequence is an arithmetic sequence. Common difference is $10$.

The given sequence is $10,20,30,40,...$ Calculate the difference between consecutive terms. $20-10=10$ $30-20=10$ $40-30=10$ Consecutive terms have a common difference of $10$. So, the sequence is an arithmetic sequence.