I need help on this practice

1.

If y = f(8x ) and f'(8) =-3, find dy dx x=1 -48 O-38 O -18 Onone of the aboveThe function 3(t) = (1'3 + tz, I a 0. represents the displacements, in metres, of a particle moving along a straight line after 1' seconds. Determine the velocity when I = 3.