Final answer:
To have each team pay the least amount in Ms. Bush's league, more teams would typically reduce the cost per team, and choosing cheaper baseballs would minimize expenses. However, choosing the optimal number of teams and the price per baseball requires additional context.
Step-by-step explanation:
Ms. Bush is looking to form a league where each team pays the least amount possible. To determine whether there should be 6 or 9 teams and if each baseball should cost $3 or $4, we would need additional information regarding how these factors relate to the overall cost per team. Without that information, we cannot make an accurate conclusion. Generally, if more teams share a fixed cost, the cost per team can be reduced. Likewise, choosing the cheaper cost for baseballs will lower expenses.
For instance, if Ms. Bush has a fixed cost of $120 for a service needed by all teams, having 9 teams instead of 6 would reduce the individual team cost from $20 ($120/6) to around $13.33 ($120/9). Similarly, if a team needs 10 baseballs, they would pay $30 at $3 per baseball, compared to $40 at $4 per baseball.
Thus, it generally makes sense to have more teams to reduce the cost per team and to go with the cheaper option for baseballs to minimize expenses. However, the final decision should address other factors such as league size preferences and the quality of the baseballs.