Express each of the following in the form b or bi, where b is a real number
`(20i)/(4)`

Answer

To express \(\frac{20i}{4}\) in the form \(b\) or \(bi\), where \(b\) is a real number, follow these steps:

### Step-by-Step Solution:

1. **Write the expression**:
\[ \frac{20i}{4} \]

2. **Simplify the fraction**:
Divide the numerator by the denominator:
\[ \frac{20i}{4} = 5i \]

3. **Identify the form**:
The expression \(5i\) can be compared to the form \(bi\), where \(b\) is a real number.

4. **Determine the value of \(b\)**:
Here, \(b = 5\).

### Final Answer:
Thus, the expression \(\frac{20i}{4}\) in the form \(b\) or \(bi\) is:
\[ 5i \]