I need answers before the clock runs out on Chegg. Take the \"Remaining Time\" a

Question

I need answers before the clock runs out on Chegg. Take the "Remaining Time" and subtract 20 minutes from it. This is when I need the answers. I'll reward partial questions answered too!

UPDATE: I Solved for # 18 and #19 already

If u(t) = (sin 4t, cos 7t, t) and v(t) = , use formula 4 of this theorem to find d/dt [u(t) v(t)]. If u(t) = (sin 6t, cos 6t, t) and v(t) = , use formulas 5 of this theorem to find d/dt [u(t) times v(t). Find the exact length of the curve. x = 4 + 12t2 , y = 9+8t3, 0 t 3

Explanation / Answer

20.) dx/dt = 24t
dy/dt = 24t^2
So, we get 24sqrt(t^2 + t^4) dt from 0 to 3
On solving, we get
244.982

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