I don’t get it and can’t find the answer can someone help me ??

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

Given the graphed function below which of the following orders pairs are found on the inverse function

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle?