Answer:
The y-intercept in this case is 4800
Step-by-step explanation:
The equation of a line graph is ;
y = mx + c
with respect to the given equation in the question, the y-intercept in this case is 4,800
In this case the y-intercept represent the height from which the plane starts to descend
4,3,2,1,0,-1, -2, -3, -4,
He will need about 3.14 or pi since circumference= pi*d