https://file.aiquickdraw.com/mathbot/file/1725826472155r95nv6zy.jpg

The expression given in the image is:

\[
90 - \frac{-1}{-2} + 15
\]

Let's solve it step by step:

1. Simplify the division inside the fraction:
   
   \[
   \frac{-1}{-2} = \frac{1}{2} = 0.5
   \]

2. Substitute back into the expression:

   \[
   90 - 0.5 + 15
   \]

3. Perform the operations from left to right:

   \[
   90 - 0.5 = 89.5
   \]

4. Add 15 to the result:

   \[
   89.5 + 15 = 104.5
   \]

So, the final answer is:

\[
\boxed{104.5}
\]

Would you like more details on this or have any questions?

### Related Questions:
1. What happens if the expression inside the fraction is different?
2. How would the result change if a negative value were added instead of positive?
3. Can the expression be rewritten in another form to simplify the calculations?
4. How do operations change if division by zero is involved?
5. How would the outcome differ if the order of operations was incorrect?

**Tip:** Always follow the correct order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division (left to right), Addition and Subtraction (left to right)) when solving expressions to avoid errors.

Learn how to solve the arithmetic expression 90 - (-1) / -2 + 15 step-by-step. This problem illustrates the application of the order of operations (PEMDAS) and is suitable for students in Grades 5-7.

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