Solve the math problem
Only solve 3 and 4

Answer:
Step-by-step explanation:
3) Cost of o balloons = 0
4) It represents a proportional relation ship.
Reason
[tex]\dfrac{25.50}{3}=\dfrac{42.50}{5}=\dfrac{59.50}{7}=\dfrac{76.50}{9}=8.5[/tex]