Help which one is it ???

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120

Aband wants to create a cd of their last concert. to creat the cds, the cost will be $350 advertisement fee plus $3 per cd.write an inequality that represents how many cds they can buy with a maximum of $1225.solve the inequality

Find the x-intercepts for the parabola defined by this equation: y=-3x^2-6x+9