The drama group has 90 minutes to practice 2 scenes

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

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4