(a)[4]
Express as one fraction in simplest form: $\frac{x+3}{x-3} - \frac{x-2}{x+2}$.
(b)[2]
Use $2^{12} \div 2^k = 32$ to determine $k$.
(c)[3]
Expand and simplify the product $(y+3)(y-4)(2y-1)$.
(d)[3]
Rearrange $x = \frac{3+x}{y}$ to make $x$ the subject.