The total cost, c, in dollars, of b bottles of water is c = 1.1b. What is the constant of proportionality?
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we'll this would mean that the dunk tank and the bounce house are the same for 20 hours because the 2 represents that the two activities, and the 20 represents the amount of hours they both are. so with this said, it means that the answer is c. the costs for a dunk tank and bounce house are the same for 20 hours.

c.the costs for a dunk tank and bounce house are the same for 20 hours.

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yes i do see that. i say this because i am doing my very best in high school so i can get a scholarship and credits.  

you need to give more info