You have the 175 on the wrong line, the problem says 175 feet from the base, this is the bottom of the tree.
See attached picture for solution:
9,6^2+18,8^2=X^2
92,16+353,44=X^2
X^2=445,6
X=21
True such as
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
or
1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010
1/2 is the answer. I hope this helps
589, 310
The 8 value is in the 10,000s place.
598, 301
The 8 is in the 1000s place.
So the difference of 10,000 over 1000 is 10
So your answer is B