Answer:
I think it's 3
Step-by-step explanation:
If 2 is c than subtract it and it's 3?
Answer: 8.75 miles
Explanation: this is simple, just add the descending variable to the current elevation to get the previous elevation.

Multiply both sides by 3.
4x + 4 = 36
Subtract 4 from both sides.
4x = 32
Divide both sides by 4.
x = 8
Answer: A is correct answer
Step-by-step explanation:
Isolate the K by subtracting 19 from both sides
(19-19)-k=(4-19)
-k=-15
Get rid of the negative by dividing
-k/-1=-15/-1
k=15
Hope I helped ❤