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Answer:
15
Step-by-step explanation:
Use the distance formula
d = distance
[tex]d=\sqrt{(10-1)^2 + (-4 - (8))^2\\[/tex]
Solve the equation to get the following:
[tex]d=\sqrt{9^2 + (-12)^2}[/tex]
[tex]d = \sqrt{81+144[/tex]
[tex]d=\sqrt{225[/tex]
[tex]d = \sqrt{15[/tex]