30 increased by 3 times the square of a number

Which system of linear inequalities is represented by the graph? + l tv x-3y > 6 and y > 2x o x + 3y > 6 and y o x-3y > 6 and y> 2x o x + 3y > 6 and y > 2x + 4 la +

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

We just started the introduction into circles and i have no idea how to do this.