A company sells wireless speakers for $140 each. To produce a batch of n wireless speakers, there is a cost of $78 per wireless speaker and a fixed or setup cost of $11,200 for the entire batch. Determine a function that gives the profit in terms of the number of wireless speakers produced. What is the number of wireless speakers that must be produced and sold in order for the company to break even?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.