28 km
We calculate the circumstance by multiplying the diameter by Pi. Therefore to get the diameter we need to devide the circumstance by Pi
Answer:
the answer is to your equation is t=-0.8
To solve this problem you must apply the proccedure shown below:
1. Clear the radius from the formula for the circumference of a circle and substitute values, as following:

2. Substitute the radius calculated into the formula for calculate the surface area of the sphere:

The answer is: 
Answer: A
Step-by-step explanation:
3 - 4z - 4 = 3z - 2 - z
-4z - 1 = 2z - 2
2z + 4z = -1 + 2
6z = 1
z = 1/6
Hope this helps!