Determine whether each relation is a function

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

Find the difference (8ab+a+2) - (3ab+6)

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'