The ratio of staff to guests at a gala was 3 to 5. If there were a total of 576 people in the ballroom, how many guests were at the gala?

James decided to invest in some lawn mowing equipment to start his own lawn mowing business. He spent $885 in a lawn mower and it costs him $20 on gasoline every day. James provides lawn mowing services for $35 per day. How many days will it take for James to break even? (Assume that there are no costs other than gasoline)

A wireless phone company charges a set fee of $55 for it's basic plan, which includes 3 gigabytes of data. If a customer uses more than the 3 gigabytes of data, they are charged an additional $40 per gigabyte. Which equation could be used to represent a customer's bill, V, based on using d gigabytes of data last month?