I'm guessing you're having trouble figuring out the relationship between what you are given and what you are asked to find. I'm also assuming that once you know the relation, you know how to solve it

a) Amplitude is pretty similar to max and min value of a function. Use the usual process (i.e. find deriv, set deriv to zero, and solove) to find critical points.

b) frequency is # of occurance of a repeating process per unit time. Think of that in mathamatical terms.

c) reciprocal of frequency

d) plug 0.014s into deriv