(a) Determine the rate of change of the following functions. Note that you must show all the steps in your working out, name any rule you are using, and your final answer must be fully simplified. (i) y = x + 3x - +3 11 1 (ii) y = (8x + 2x) (iii) (iv) y = 4 ln(3t) (v) y = 4 tan 30 (vi) y = 8e y = 8et sin t