the position of a particle on the x-axis is given:(adsbygoogle = window.adsbygoogle || []).push({});

x = 7.8 + 9.2t -2.1t^3

what is the velocity at t = 3.5 s ?

so i need to find the derivative of d/dt (7.8 + 9.2t -2.1t^3)

i'm completely lost on how to find it. thanks.

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# Homework Help: First Derivative? 1st physics calculus class-help

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