Ineed with this math problem they’re exponents

Someone me! if you’re smart you can solve this!

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?

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)