1.1. The number of cases of an unknown virus are modelled by the formula

$V=\frac{225}{{(d-15)}^{2}}0\leqd<15$

where $d$is the number of days after the first case was discovered and $V$ is the total number of cases to date.

Find the number of cases after 10 days.

1.2. Sketch a graph of $V$ against $d$, clearly marking the coordinate where the graph intersects the $V$-axis.

1.3. A politician says that after 5 days there were 2.25 cases of the virus. Comment on the politician’s statement.