A phone company charges its customers 50 or the first 500 minutes used each month For any additional minutes used over the 500 the customer is charged an additional 10 per minute Find the piecewise function that describes this situation O 50 1m m 500 m 500 O f x f x f x 50 f x 50 50 1m 50 50 m 500 m 500 50 1 m500 f50 1 m 500 m 500 m 500 m 500 m 500