Can someone help me please

Multiplying an even number of negative numbers gives an answer that is choose from:

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

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?