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The image contains three math problems involving fractions and division. I will break them down and solve them for you:

### Problem 12:
\[
12 - \frac{8}{9} \div (-1)
\]
1. Division: \(\frac{8}{9} \div (-1)\) is equivalent to multiplying \(\frac{8}{9}\) by \(-1\), which gives \(-\frac{8}{9}\).
2. Now the expression becomes:
\[
12 - \left(-\frac{8}{9}\right)
\]
3. Subtracting a negative is the same as adding, so the final expression is:
\[
12 + \frac{8}{9} = \frac{108}{9} + \frac{8}{9} = \frac{116}{9}
\]
Thus, the result is:
\[
\frac{116}{9}
\]

---

### Problem 15:
\[
\frac{7}{2} \div \left(-2 \frac{1}{4}\right)
\]
1. Convert mixed number \( -2 \frac{1}{4} \) to an improper fraction:
\[
-2 \frac{1}{4} = -\frac{9}{4}
\]
2. Now divide \(\frac{7}{2}\) by \(-\frac{9}{4}\), which is the same as multiplying by the reciprocal:
\[
\frac{7}{2} \times -\frac{4}{9} = -\frac{28}{18} = -\frac{14}{9}
\]
Thus, the result is:
\[
-\frac{14}{9}
\]

---

### Problem 18:
\[
\frac{7}{4} \div \left(-\frac{8}{3}\right)
\]
1. To divide fractions, multiply by the reciprocal:
\[
\frac{7}{4} \times -\frac{3}{8} = -\frac{21}{32}
\]
Thus, the result is:
\[
-\frac{21}{32}
\]

Would you like further details on any of these solutions, or need help with additional steps?

### Related Questions:
1. How do you convert a mixed number to an improper fraction?
2. What is the process for dividing two fractions?
3. How do you simplify the result of a fraction multiplication?
4. Can you explain the rule for subtracting a negative number?
5. What are some common mistakes when dealing with negative signs in division?

**Tip:** When dividing fractions, always remember to multiply by the reciprocal of the divisor.

The image contains three math problems: 12 - 8/9 ÷ (-1), 7/2 ÷ (-2 1/4), and 7/4 ÷ (-8/3).

This lesson covers fraction division and operations with negative numbers. Learn how to solve problems like 12 - 8/9 ÷ (-1), 7/2 ÷ (-2 1/4), and 7/4 ÷ (-8/3) with detailed step-by-step solutions. Suitable for Grades 6-8.

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