Element of Circle
the central angle (α) = (the length of the arc x 360°)/2πr (r = radius)

convert to rad:

Step-by-step explanation:
4x^2-9
=(2x)^2 -3^2
=(2x+3) (2x-3)
Hope this helps you.
To get simplest form you make it the smallest fraction you can make it by dividing both sides by the same number until it's not possible anymore Hope that helped!
Six dollars is the only answer that seems correct using the graph. Hope this helped.