Question 1 1.1. Given: $$ \sqrt{9+25} ; \pi-4 ; \sqrt[3]{-27} ; \frac{2}{3} ; \frac{18}{2} ; \sqrt{-27} $$ From the list given above, write down: 1.1.1. A natural number. 1.1.2. A negative irrational number. 1.1.3. A non-real number. 1.1.4. A rational number which is not an integer.

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Let's analyze each expression in the given list step by step to identify the required types of numbers.

1. **Evaluate each expression:**
   - $$ \sqrt{9+25} = \sqrt{34} $$ (This is a positive irrational number.)
   - $$ \pi - 4 $$ (This is a positive irrational number since $$ \pi $$ is irrational.)
   - $$ \sqrt[3]{-27} = -3 $$ (This is a negative integer.)
   - $$ \frac{2}{3} $$ (This is a rational number, specifically a non-integer.)
   - $$ \frac{18}{2} = 9 $$ (This is a natural number.)
   - $$ \sqrt{-27} = 3i\sqrt{3} $$ (This is a non-real number.)

2. **Identify the required types of numbers:**
   - **1.1.1. A natural number:** $$ 9 $$ (from $$ \frac{18}{2} $$)
   - **1.1.2. A negative irrational number:** None of the expressions are negative irrational numbers. The closest is $$ \pi - 4 $$, but it is positive.
   - **1.1.3. A non-real number:** $$ \sqrt{-27} = 3i\sqrt{3} $$
   - **1.1.4. A rational number which is not an integer:** $$ \frac{2}{3} $$

3. **Final Answers:**
   - 1.1.1: $$ 9 $$
   - 1.1.2: None (no negative irrational number present)
   - 1.1.3: $$ \sqrt{-27} $$
   - 1.1.4: $$ \frac{2}{3} $$
- **1.1.1. A natural number:** 9 - **1.1.2. A negative irrational number:** None - **1.1.3. A non-real number:** √(-27) - **1.1.4. A rational number which is not an integer:** 2/3

Question 1
1.1. Given:
From the list given above, write down:
1.1.1. A natural number.
1.1.2. A negative irrational number.
1.1.3. A non-real number.
1.1.4. A rational number which is not an integer.

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Question 1 1.1. Given: From the list given above, write down: 1.1.1. A natural number. 1.1.2. A negative irrational number. 1.1.3. A non-real number. 1.1.4. A rational number which is not an integer.