help please this question is driving my crazy.

Question

Suppose there is a 2-degree drop in a temperature for every thousand feet that an
airplanes climbs into sky. If the temperature on the ground is 65 degrees, what would be
the temperature when the plane reaches an altitude of 23,000 ft?

Answer 1

23000/1000 = 23
23*2 = 46 degree-drop
therefore,
65-46 = 19 degrees

so there,, :)

Answer 2

after diving 90m below the sea level, a diver rises at a rate of 4 meters per minute for 8 min. Where is the diver in relation to the surface

Answer 3

distance = rate*time
distance = 4*8 = 32 meters
therefore,
90-32 = 58 meters BELOW sea level

so there,, :)