Answer:
5.83095 or √34
Explanation:
Find the difference between coordinates: 
(x2-x1) = (-1 - -4) = 3 
(y2-y1) = (-10 - -5) = -5 
Square the results and sum them up: 
(3)2 + (-5)2 = 9 + 25 = 34 
Now Find the square root and that's your result: 
Exact solution: √34 = √34 
Approximate solution: 5.831