The height of Mount Everest is $29,029 \mathrm{ft}$. The lowest point on the surface of the Earth is $-35,798 \mathrm{ft}$ (that is, 35,798 ft below sea level) occurring at the Mariana Trench on the Pacific Ocean floor. What is the difference in altitude between the height of Mt. Everest and the Mariana Trench?