signals

Given $x(t) = 4 \sin(15\pi t) + 7 \cos(4\pi t)$, where $t$ is in seconds. The fundamental period of $x(t)$ is ________ seconds.

A signal x(t) is shown below. The plot of y(t) = 1 - x(4-t) is shown in ________.

Given two signals: x(t) = u(t − 2) – u(t - 3), and y(t) = e^(-4t)u(t). If z(t) = x(t) * y(t), then Z(s) is _________.