Answer:
Not a solution
Step-by-step explanation:
In order for 
to be a solution, the result after substituting must be 0:
Therefore, is not a solution to 
0.006 is 1/10 of 0.06 .
Correct me if I am wrong.
Answer:
area = 138 m²
Step-by-step explanation:
radius of large circle = 12 m
radius of small circle = 10 m
large circle area = πr² = (3.14)(12²) = 452.16 m²
small circle area = πr² = (3.14)(10²) =314 m²
452.16 - 314 = 138.16 m²
It will take him 80 minutes, or an hour and 20 minutes
