Answer:
1. One solution.
2. No solution.
3. Infinite solutions.
4. One solution.
Explanations:
1. This has one solution because 15n= 45 ONLY when n=3.
2. This has no solution because when simplified, 0≠-1.
3. This has infinite solutions because when simplified, 0=0.
4. This has one solution because 8n=-8 ONLY when n=-1.
