Explain how to plot the inequality-3<=x

Wei can purchase 300 balloons.

The model used for the problem is .

Step-by-step explanation:

Let the number of white balloons = x

The cost of blue balloons and white balloons are 60 cent = $0.6 and 30 cents = $0.3 respectively.

Wei purchased 100 blue balloons and have $150 to buy both balloons.

So, we get the relation,

i.e.

i.e.

i.e.

Thus, Wei can purchase 300 balloons.

So, the model used for the problem is .