When functions are defined by more then one equation, they are called piecewise defined functions
U first find the common denominator which is 8
Then subtract to get 7/8
Volume = length x width x height:
Volume = 3 x 6 x 2 = 36 cubic inches.
$40/12 = unit rate simplify = 10/3
$10/3 per book
18 * 10/3 = $60 for 18 copies