How do you solve his problem

Answer:
20
Step-by-step explanation:
[tex] d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} [/tex]
[tex] d = \sqrt{(-6 - 10)^2 + [7 - (-5)]^2} [/tex]
[tex] d = \sqrt{(-16)^2 + (7 + 5)^2} [/tex]
[tex] d = \sqrt{256 + 12^2} [/tex]
[tex] d = \sqrt{256 + 144} [/tex]
[tex] d = \sqrt{400} [/tex]
[tex] d = 20 [/tex]
Answer: 20