Answer:
Option B. [tex]b\geq 9[/tex]
Step-by-step explanation:
Let
b------> the number of buses
we know that
[tex]48b\geq (412+20)[/tex] -----> inequality that represent the situation
Solve for b
[tex]48b\geq 432[/tex]
[tex]b\geq 432/48[/tex]
[tex]b\geq 9[/tex]