Determine the current flowing through an element

Determine the current flowing through an element if the charge flow is given by

a) q(t) = (3t + 8) mC
b) q(t) = (8t² + 4t - 2) C
c) q(t)=(3e−1−5e−2t)nC
d) q(t) = 10 sin 120 πt pC