Use exact values when evaluating sine and cosine. Can u explain in simple terms that way its easier for me to understand Part A: Find −7u ⋅ v. Show your work.  Part B: Use the dot product to determine if u and w are parallel, orthogonal, or neither. Justify

Vectors u = −4(cos 60°i + sin60°j), v = 8(cos 135°i + sin135°j), and w = 12(cos 150°i + sin150°j) are given. Use exact values when evaluating sine and cosine.

Can u explain in simple terms that way its easier for me to understand
Part A: Find −7u ⋅ v. Show your work. 
Part B: Use the dot product to determine if u and w are parallel, orthogonal, or neither. Justify your answer.