Which one of these is a function?

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

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

41/17 as a decimal rounded to the nearest hundredth