On vacation Nakala hiked to the 9915 foot summit of Haleakala volcano in Hawaii. The next day she went scuba diving at a depth of 61 feet below sea level. What is the difference between the elevation of the summit of Haleakala and the depth Nakala dove?

feet

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity