Find the derivative.

y=7x⁴-0.6⁶

i got 28x³-3.6⁵ but this was incorrect.

Evaluate the derivative of the following function at the given point.(1,8)

y=4x²-2x+6

I got f(x)=8x+2 and when I put the 1 in i got 10 but that is wrong.

Let s represents thedisplacement, and let t represents the time for an object moving with rectilinearmotion, according to the given function. Find the instantaneous velocity for the given time.

s=7x³-9x², t=4

The instantaneous velocity is =?

I totally messed this one up.