What are the variable terms for 7k-8k?

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

How can (square root of 25) ^2 be rewritten?

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?