Question

Please help! This is about vectors. The answers are A) 11 B) 15 C) 17 D) 21

Answer 1

S(-3,0) & y(1,-3)
you can multiply y by 5 then calculate or you multiply by 5 in the equation
so you take (x) of s and subtract it from 5(x) of y and add it to (y) of s subtarcted from 5(y) of y then make radical for the formula
$s - 5y = \sqrt{( - 3 - 5(1)) {}^{2} + (0 - 5( - 3)) {}^{2} } = \sqrt{64 + 255} = \sqrt{289} = 17$