Riya and Joshwa are solving a maths puzzle. Their teacher asks them to find the multiplicative inverse of different rational numbers. Riya picks the number \(\frac{−3}{7}\), and Joshwa picks \(5\). They both need to find the correct multiplicative inverse of rational numbers.
Based on this case, answer the following questions:
1. What is the multiplicative inverse of \(\frac{-3}{7}\)?
2. What is the multiplicative inverse of \(5\)?
3. Which of the following rational numbers does not have a multiplicative inverse?