Respuesta :
Let
x-------> the total number of empty spaces in the bike racks
y------> the total number of spaces in the bike racks
z-------> the total number of bike in the bike racks
we know that
[tex] x=y-z\\ y=15*4=60\\ z=16 [/tex]
[tex] x=y-z\\ x=60-16\\ x=44 [/tex]
therefore
the answer is
the total number of empty spaces in the bike racks is [tex] 44 [/tex]
the expression is equal to
[tex] x=4*15-16 [/tex]