probrably at the schools website but i dont know what school you go to so i would need more info
Answer:
Pt 1: 
Pt 2: θ = 
Explanation:
Part 1:


imagine the "i"and the "j" with the hat




Part 2:




θ
θ
θ = 
Hope it helps
Using the velocity-time graph, the displacement can be calculated by the area under the velocity-time graph. At 3 seconds the total displacement is then equal to (4)(2) + (4 + 2)*1/2 = 11 m. Assuming that the starting point is at x = 0, then the particle at t=3s is at x=11 m.
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2 thing it is used for are commonly like wind turbines and water turbines.