Respuesta :

The first problem is modeled by the following inequality:

[tex]40+5x\ge95-4x[/tex]

The second problem is represented by

[tex]95+4x<40+5x[/tex]

The third problem is represented by

[tex]95-4x<40+5x[/tex]

Observe that, "spending" refers to subtraction, "earnings" refers to addition. Also, the variables represent time. Additionally, "less than" is expressed as "<", "as much as or more than" is expressed as >=.