The image contains the equation:

$8 + 9 = ?$

To solve this:

$8 + 9 = 17$

So, the answer is $17$.

Would you like further explanation on this or have any additional questions?

Here are some related questions you might find interesting:

1. What is the sum of 8 and 9 in different number systems, like binary or hexadecimal?
2. How can I add larger numbers efficiently without a calculator?
3. What are the properties of addition in arithmetic?
4. How does addition work with negative numbers?
5. How can I use mental math tricks to add numbers quickly?

Tip: Breaking numbers into parts (like adding 8 and 10, then subtracting 1) can make mental addition easier!