Convert the following in the form of a complex number :
(i) `(2, -5)`
(ii) `(-3,1)`
(iii) ` (0, -2)`

Explanation

To convert the given ordered pairs into complex numbers, we will follow the standard form of a complex number, which is expressed as \( z = x + iy \), where \( x \) is the real part and \( y \) is the imaginary part.

### Step-by-Step Solution:

**(i) For the ordered pair \( (2, -5) \):**
1. Identify the real part \( x \) and the imaginary part \( y \):
- \( x = 2 \)
- \( y = -5 \)
2. Substitute these values into the complex number form:
\[ z = x + iy = 2 + i(-5) \]
3. Simplify the expression:
\[ z = 2 - 5i \]

**(ii) For the ordered pair \( (-3, 1) \):**
1. Identify the real part \( x \) and the imaginary part \( y \):
- \( x = -3 \)
- \( y = 1 \)
2. Substitute these values into the complex number form:
\[ z = x + iy = -3 + i(1) \]
3. Simplify the expression:
\[ z = -3 + i \]

**(iii) For the ordered pair \( (0, -2) \):**
1. Identify the real part \( x \) and the imaginary part \( y \):
- \( x = 0 \)
- \( y = -2 \)
2. Substitute these values into the complex number form:
\[ z = x + iy = 0 + i(-2) \]
3. Simplify the expression:
\[ z = -2i \]

### Final Answers:
1. For \( (2, -5) \): \( z = 2 - 5i \)
2. For \( (-3, 1) \): \( z = -3 + i \)
3. For \( (0, -2) \): \( z = -2i \)