Does anyone know how to find the unit vector of: v: < -6, -8> ?

it's either,
a.) < 3/5, 4/5 >
b. < -3/5, -4/5 >
c.) < 4/5, 3/5 >
d.) < -4/5, -3/5 >
.

Measures of the angle of r, 31 s (x+4) t (3x+9)

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided