2.2: Cosine curve properties and graph equation

Given that $y = 7\cos 10x - 3$, where the angle $x$ is measured in degrees, state the period of $y$.

State the amplitude of $y$.

Find the equation of the curve shown, in the form $y = a\,g(bx) + c$, where $g(x)$ is a trigonometric function and $a$, $b$ and $c$ are integers to be found.