Final answer:
To add fractions, you add their numerators and keep the denominators the same. The fraction 9/17 + 11/17 simplifies to 20/17.
Step-by-step explanation:
To perform the indicated operation of 9/17 + 11/17, you simply add the numerators (the numbers on top) and keep the denominator (the number on the bottom) the same. This gives you a result of 20/17. However, as it's best to express fractions in simplest form, you can simplify the fraction by dividing both the numerator and denominator by their greatest common divisor, which in this case is 1. So the final answer is 20/17.