Mount marshak towers above the landscape at 5.3 km tall. the rate of uplift at mount marshak is 1.3 mm/yr and the rate of erosion is 1.5 mm/yr. how tall will mount marshak be after a million years, assuming everything remains constant?

Assuming that everything remains constant, after one million years, Mount Marshak would be 5.1km tall. This is because the mountain would be uplifted by 1.3km after a million years but also eroded 1.5km after a million years. The difference is 0.2km in the direction of erosion. This means the mountain would be 0.2km smaller than it was before. 5.3-0.2=5.1.

Yup no bull frogs here man