A. Multiply the following.
1. (-2a³)(-5a)
2. (7x²)(xy⁵)(2x³y²)
3. (-2r³s⁴)(6r²s)
4. (4a³bc²)(a³b²c)(3ab⁴c⁵)
5. (x - 8)(7x + 4)
6. 3x(2x² + 5x - 4)
7. (2x² - 5x)(9x² - 4x)
8. (2x + 10)(4 - x + 6x³)