1. Find the value of the expression z³ - 2(z - 10) for z = 10
2. Find the value of the expression - x + 2 for x = -2
3. Find the value of the expression 3p + 7 for p = -2
4. Find the value of the expression a³ + b³ + c³ - 3abc for a = 2, b = 3, c = 4
5. If the value of the expression x² - 5x + k for x = 0 is 5, then the value of k is