Question

Evaluate the dot product of (-1,2) and (3,3).

Answer 1

(-1,2) dot (3,3) = -1*3+2*3 = -3+6 = 3

Answer 2

http://www.sparknotes.com/physics/vectors/vectormultiplication/section1.html

Answer 3

use the law of cosines to find the value of cos Round answer to two decimal places

A. 1.14

B. 0.21

C. 0.85

D. 0.33

Answer 4

well you are missing more information in order to use the laws of cosine