1. Find all roots of the cubic polynomial given by p(x) = x³ + 6x - 20.
2. How is a quartic equation solved?
3. 1. What is perspective?
   2. Who are the scientists to apply it first? What areas did they apply it?
   3. Why did the Catolic Church did not like the idea of perspective?
4. What is the difference between engineering and science?