The three points and two points must swop, and the different slopes and the same slope must swop too.
The equation is:
y = 10 sin(π/15 t) + 30
where 30 represents the initial height of the blade above the ground and π/15 represents the period as we are given that the blade completes two rotation every minute.Finally the 10 represents the length of the blades.
Hope this helps :)
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2 + 3x = 17
2 + 3(5) = 17
2+ 15 = 17
