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Sagot :
Answer
The function rule that models the total cost of a purchase is
f(x) = 1.19x dollars
15 bottles will cost $17.85
Explanation
Each bottle costs $1.19.
If one buys x bottles, the total cost of purchase will be
f(x) = 1.19 × x = 1.19x dollars.
Hence, the function rule that models the total cost of a purchase is
f(x) = 1.19x dollars
So, to evaluate the function for 15 bottles.
When x = 15
f(15) = 1.19 × 15 = $17.85
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