Answer :
Okay. This is going to be a very long one.
[tex] \sqrt{(x_{2}-{x_1)}^{2}+(y_2-y_1)^2} = distance \\-3--7 = 4, 4^2 = 16 \\4-4 = 0, 0^2 = 0 \\\sqrt {16} = 4 \\\boxed 4[/tex]
[tex] \sqrt{(x_{2}-{x_1)}^{2}+(y_2-y_1)^2} = distance \\-3--7 = 4, 4^2 = 16 \\4-4 = 0, 0^2 = 0 \\\sqrt {16} = 4 \\\boxed 4[/tex]