Answer:
See explanation
Step-by-step explanation:
The equation of the shpere canterd at point
with radius
is

The center of the sphere is (2,-9,1), the radius is 2, then the equation is

Now, find the intersection of this sphere with the plane z=2. Substitute 2 instead of z into the sphere equation:

This is the equation of the circle lying in the plane z=2 with center at (2,-9,2) and radius 
Answer:
2.2 %
Step-by-step explanation:
1.39 / 64.51 = 0.02154...
Johans speed is 750-538=212 miles per 4-3=1hour. So in 4 hours he drove
D = 48.375 in or 48 3/8 in
Answer: 48 3/8 inches or 48.375 inches
(6/2) - 4 would be your answer