can someone tell me if my work on J is correct i 2 1 i 2 3 5

can someone tell me if my work on J is correct?

(i) -2 -1 i 2 3 5 the theater makes is a function of the number of people n, in attendance 1 a ticket costs $4, find the domain and range of this function. (k) A car gets the best mileage at intermediate speeds. Let the gas mileage be a function of speed. Determine a reasonable domain and range for the function and justify your reasoning.

Solution

domain will be the number if seats occupied by n people
n can very from 0 to 200
so, domain is [0,200]
and the cost of price is given by 4n where n=0 to 200
so minimum value is 4*0=0 and maximum value is 4*200=800
range is [0,800]