In Exercises 1-4, write the profit function for the given expense and revenue functions.
1. E = -20,000p + 90,000 R = -2,170p2 + 87,000p
2. E = -6,500p + 300,000 R = -720p2 + 19,000p
3. E = -2,500p + 80,000 R = -330p2 + 9,000p
4. E = -12,500p + 78,000 R = -1,450p2 + 55,000p