Anyone good with vectors?

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

Anyone good with vectors?
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
Reply:Thank you for your vote. Report It

Reply:a. -i + 2.5j


b. 5i - j (3i + 2i, 5j - 4j)


c. 5 (use Pythagorean theorem)
Reply:v/2 = -i+(5/2)j





w-v = 5i-j





lengh of w = sqrt(3^2 + 4^2)


= sqrt(9+16)


= sqrt (25)


= 5