Solve for x for 19 - 24

Find the measurement of the indicated in bold for 25 - 28

Is a positive integer raised to a negative power always positive

Sum is 17 and their difference is 3

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?