Help with any of these would be so appreciated!

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

The graph shown is the graph of which function?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)