When you have a number to the nth root do you always put plus or minus in the answer or is that only for square root?

3. solve the given inequality and graph the solution on a number line.

Which answer is the solution set to the inequality |x|< 9? a. x< -9 or x> 9 b. x> -9 and x< 9 c. x> -9 or x< 9 d. x< 9 and x< 9

The table above shows approximate conversions from gallons to liters. what is the value of x?