Please help with a, b, c

Answer:
a. p(n) is a function of n
b. p(2)=12.50
c. {0, 1, 2, 3, 4}
Step-by-step explanation:
A function is a rule or equation the p(n) depends on the variable n. We write it as p(n) is a function of n. It can also be written in symbols using p(input)=output for (input,output). We write p(2)=12.50. Lastly, every function has a domain which consists of input values or n values used. Here it is 0, 1, 2, 3, 4.