I’ve looked at this for a while, can someone clear up the answers for me? i can’t figure it out.

An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i