Answer:
67 cars.
Step-by-step explanation:
Let x represent number of cars.
We have been the science club charges $4.50 per car at their car wash. the amount earned for washing x cars would be [tex]4.50x[/tex].
We have been given that the science club have to earn at least $300. This means that amount earned for washing x cars would be greater than or equal to 300.
We can represent this information in an inequality as:
[tex]4.50x\geq 300[/tex]
[tex]\frac{4.50x}{4.50}\geq \frac{300}{4.50}[/tex]
[tex]x\geq 66.66[/tex]
Since the closest integer to 66.66 is 67, therefore, they have to wash 67 cars to earn at least $300.
