Answer: 942 ft
Step-by-step explanation: I hope this helps!
12 +4m = 24
4m = 12
m = 12/4
m = 3 so choice C. is right sure
To round off to 10, the difference should range from 5 to 14. If the difference between two numbers is from 5 to 14, they all are rounded to 10.
Example:
(near to 10)



When A is reflected over y=-1, -1+(-1-(-2))=0, it lands on (-5, 0), when it is then reflected over x=3, 3+(3-(-5))=11, it lands on (11,0)
If you can't visualize it, draw a graph.