24-25 please help I don’t understand what to do

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

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !