The given values are .

                                  (Use pythagorean theorem)

                         (Substitute )

                               (Evaluate powers ) \ \

               (Subtract 49 from each side)

                         (Apply additive inverse property: )

                               (Apply additive identity property: )

                                       (Subtract: )

                                (Take the square root of each side)

                                    (Cancel square and root)

                                        (Use calculator)

Length cannot be negative , so the missing length is 24 units.

The length is 24 units.