the square root of the product of a number and four, divided by two hundredths written as a mathematical expression​

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

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

With alll of except for the 2 that i did already