(a) Which term of the progression 4 + 8 + 12 + ... is 76 ?
(b) Which term of the progression 36 + 33 + 30 + ... is zero ?
(c) Which term of the progression `(3)/(4)+1+(5)/(4)+..." is "12?`

Explanation

Let's solve the question step by step.

### Part (a): Which term of the progression 4 + 8 + 12 + ... is 76?

1. **Identify the first term and common difference**:
- The first term \( a = 4 \)
- The common difference \( d = 8 - 4 = 4 \)

2. **Use the formula for the nth term of an arithmetic progression**:
- The formula for the nth term \( a_n \) is given by:
\[ a_n = a + (n - 1) \cdot d \]
- We need to find \( n \) such that \( a_n = 76 \).

3. **Set up the equation**:
\[ 76 = 4 + (n - 1) \cdot 4 \]

4. **Simplify the equation**:
\[ 76 = 4 + 4n - 4 \]
\[ 76 = 4n \]

5. **Solve for \( n \)**:
\[ n = \frac{76}{4} = 19 \]

Thus, the 19th term of the progression is 76.