Iwanna know an integer greater than -3 but less than 3

Which value is not a solution of 8x^3 – 1 = 0

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

With alll of except for the 2 that i did already