Respuesta :
Answer:
[tex]10\ stamp\ packets[/tex]
Step-by-step explanation:
Let
x-----> the number of packets that mark can buy
we know that
[tex]1.78x\leq 19[/tex] -----> inequality that represent the situation
Solve for x
Divide by [tex]1.78[/tex] both sides
[tex]x\leq 19/1.78[/tex]
[tex]x\leq 10.67\ stamp\ packets[/tex]