Anyone good with vectors?

Question

I need help:

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

a.) 1/2v b.) w-v c.) the length of w

Answer 1

Question a)
(1/2) v = - i + (5 / 2) j

Question b)
3 i + 4 j + 2 i - 5 j
5 i - j

Question c)
| w | = √ (3 ² + 4 ²)
| w | = 5

Answer 2

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Answer 3

a. -i + 2.5j
b. 5i - j (3i + 2i, 5j - 4j)
c. 5 (use Pythagorean theorem)

Answer 4

v/2 = -i+(5/2)j

w-v = 5i-j

lengh of w = sqrt(3^2 + 4^2)
= sqrt(9+16)
= sqrt (25)
= 5