Log_10 100 is the same as 10 to the x power is 100
10^x=100
10^2=100
the answer is 2
Why not write all of the numbers in decimal fraction form, to make them easier to compare?
68 2/3 = 68.666...
72 1/2 = 72.500
68 3/10 = 68.300
74 7/11 = 74.636...
68 1/2 = 68.500
550/8 = 68.750
Now ask yourself: Which of the last four numbers is between 68.666.. and 72.500?
-3 + (-6) = -9
This relates to to the problem because the team has lost a total of nine yards.