Find the length of a line segment with end points of -9 and 7

If the segment begins at -9 and ends at 7, it will have a length of 17.

-9, -8, -7, -6, -5, -4, -3, -2, -1, 0,  1, 2 , 3, 4, 5, 6, 7 (Imagine this is the line segment, you can see there are 17 numbers on the line.)

in 4 days he will run   12/14

step-by-step explanation:

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6