(a)[2]
Rearrange $s = k - t^2$ so that $t$ is the subject.
(b(i))[1]
Factorise $x^2 - 25$ fully.
(b(ii))[3]
Simplify the fraction $\frac{x^2 - 25}{x^2 - 2x - 35}$.
(c)[3]
Express $\frac{x - 8}{x} + \frac{3x}{x + 1}$ as a single fraction in simplest form.
(d)[3]
Find all integer values of $n$ for which $18 - 2n < 6n \leq 30 + n$ holds.