(a(i))[1]
Write down the smallest population value.
(a(ii))[1]
Find how much the areas of Sri Lanka and Pakistan differ. Give your answer in standard form.
(a(iii))[2]
A country's population density means the number of people in one square kilometre. Find the greatest population density among these countries.
(b(i))[1]
In standard form, $A = 8.6 \times 10^n$ and $B = 1.5 \times 10^{n-1}$. Give $A - B$ in terms of $n$, and present your answer in standard form.
(b(ii))[2]
In standard form, work out $A \times B$ in terms of $n$.