Simplify [2 (cos 210 + i sin 210)]^3

Tell me how you got the it use the figures to answer questions 1and 2. in each diagram, line k is parallel to line l, and line t intersects lines. 1. based on the diagrams, what is the value of x? 2. how would you verify your answer for x?

Look at attachment. has all info needed. need

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²