Answer:
Lincoln has $30 in set up costs, and it costs him $0.25 per cup to make his lemonade.
Step-by-step explanation:
Since x is the number of cups of lemonade made, 0.25x indicates that it costs Lincoln $0.25 per cup to make the lemonade.
Adding $30 to the cost tells us that he has $30 in other set up costs.
The cost function is divided by x, as it yields the cost per cup of lemonade.