#### Answer

The slope is $-28$.
The number of movie ticket sales drop by 28 million every year.

#### Work Step by Step

$(2004, 1484)$
$(2007, 1400)$
$m=\frac{1400-1484}{2007-2004}$
$m=\frac{-84}{3}$
$m=-28$
The slope is $-28$.
The number of movie ticket sales drop by 28 million every year.