Geometry test who can help me ?

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula

Find the smallest number by which the given number should be divided to make a perfect cube(with steps or the answer will get reported) a.108 b.2187