Answer:
a.
Step-by-step explanation:
[tex]d = \sqrt{( y _2 - y) {}^{2} + ( x_2 - x ) {}^{2} } [/tex]
[tex]d = \sqrt{( - 1 - 4) {}^{2} + \sqrt{ - 4 + 1) {}^{2} } } [/tex]
[tex]d = \sqrt{ - 5 {}^{2} +( - 3 {}^{2} )} [/tex]
[tex]d = \sqrt{25 + 9} [/tex]
[tex]d = \sqrt{34} [/tex]
