1. Speed of light in the material: 
The speed of light in a material is defined as follows:

where
d is the distance travelled by light in the material
t is the time taken
In this problem, we have
is the distance travelled in the material
is the time taken
So, the speed of light in the material is

2. Index of refraction: 1.71
The index of refraction of a material is defined as:

where
is the speed of light in a vacuum
v is the speed of light in the material
For this material, we have

So, the index of refraction is

The anwser is C . The court said that if they were ancestors of slaves they had no legal reason to be in court
625 /5=125/5=25/5=5
1000/5=200/5=40/5=8
is 5 Over 8
That it's more puashe on the back of the canoe and that effects the back of the canoe to fall back