Choice A is the correct answer. Real-world pricing problems often combine fixed and variable costs.

1. Fixed cost: First hour costs $6
2. Variable cost: Each additional hour costs $4, so additional hours cost $4h$
3. Total: $6 + 4h$
4. Constraint: "Has $30" means total $\leq 30$: $4h + 6 \leq 30$

?�� Strategic Tip: Identify fixed costs (constant) vs variable costs (coefficient times variable) when setting up inequalities.

Choice B is incorrect because it reverses the costs, making $6 the per-hour rate and $4 the initial fee. Choice C is incorrect because it subtracts the fixed cost, which doesn't match the pricing adding structure. Choice D is incorrect because it adds the costs (6+4=10) and multiplies by $h$, incorrectly treating both as variable.