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If the line tangent to the graph of the function f at the point ( 1 , 7 ) passes through the point ( -2 , -2 ) then f'(1)=
A particle moves along the x-axis so that at time t≥0 its position is given by x(t)=2t³-21t²+72t-53. At what time t is the particle at rest?
3 and 4
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