$\log_2 X$, $\log_2 (X+9)$ and $\log_2(X+45)$ are 3 consecutive terms of an arithmetic progression; find
$\qquad$(i) the value of X;
$\qquad$(ii) the first term and the common difference; and
$\qquad$(iii) the 5th term as a single logarithm.
$\log_2 X$, $\log_2 (X+9)$ and $\log_2(X+45)$ are 3 consecutive terms of an arithmetic progression; find
$\qquad$(i) the value of X;
$\qquad$(ii) the first term and the common difference; and
$\qquad$(iii) the 5th term as a single logarithm.