Sin120

Vectors u=-2cos 30 ° i+sin 30 ° j,v=6cos 225 ° i+sin 225 ° j , and w=8cos 120 ° i+sin 120 ° j are given. Use exact values when evaluating sine and cosine. Part A: Find -7u . v . Show your work. 4 points Part B: Use the dot product to determine if u and w are parallel, orthogonal, or neither. Justify your answer. 6 points

Vectors u=-2cos 30 ° i+sin 30 ° j,v=6cos 225 ° i+sin 225 ° j , and w=8cos 120 ° i+sin 120 ° j are given. Use exact values when evaluating sine and cosine. Part A: Find -7u . v . Show your work. 4 points Part B: Use the dot product to determine if u and w are parallel, orthogonal, or neither. Justify your answer. 6 points