12.8 miles would take the 16 friends to split the trip into 16 parts
Answer:

Step-by-step explanation:
Given

Recursive: 
Required
Determine the formula
Substitute 2 for n to determine 


Substitute 


Next is to determine the common difference, d;



The nth term of an arithmetic sequence is calculated as

Substitute
and 


Hence, the nth term of the sequence can be calculated using
X for the equations are:
1.-1.5
2.10
3.1.333
Graph of the equation y=x+3 is shown