Please help! this is due tomorrow and i really need help worth 20 and i'll mark brainliest!

kelly runs a lemonade stand at the park. the table shows the
profit she earns for different numbers of cups of lemonade sold.
cups sold profit ($)
15 1.75
21 4.75
27 7.75
30 9.25
45 16.75
a. what price does kelly charge for each cup of lemonade?

b. how many cups must kelly sell in order to make a profit?

c. write the equation that shows the amount of profit, p, for n number of
cups sold.