help with math hw!!?

Question

given the vectors v=-2i+5j and w=3i+4j, determine

1. (1/2)v
2. w-v
3. length of w
4. the unit vector for v

Answer 1

1: -1+2.5j
2: 5i-j
3: 5
4:-2/29i +5/29j

Answer 2

0.5v = -1i + 2.5j take one half of all coefficients.
w-v = 3i - (-2i) +(4j-5j) = 5i-j
length of w = SQRT(3^2 + 4^2) = SQRT(9=16)= 5
unit vector of v is vector v / length of v
lenght of v = sqrt(4+25) = sqrt29
so unit vector of v = -2/sqrt29 i + 5/sqrt29 j