(i)[2]
State the range of $f$, in terms of $p$ and $q$.
(ii(a))[1]
State how many solutions the equation $f(x) = p + q$ has.
(ii(b))[1]
State how many solutions the equation $f(x) = q$ has.
(ii(c))[1]
State how many solutions the equation $f(x) = \tfrac{1}{2}p + q$ has.
(iii)[5]
For $p = 3$ and $q = 2$, solve the equation $f(x) = 4$, showing all the working needed.