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lara [203]
3 years ago
14

a school bake sale earned over $25 from selling cookies, which cost $3 each. how many cookies did they sell? identify the number

that are include in the solution set
Mathematics
1 answer:
SSSSS [86.1K]3 years ago
5 0
It said the sale earned OVER $25 from selling cookies at $3 dollars each so if we let r=revenue , p=price per cookie and c=number of cookies sold:

pc>r  and since p=3 and r=25 

3c>25  divide both sides by 3

c>25/3

Since cookies are quantized units, they must be integers so:

c>8 1/3

c≥9  or in interval notation

c=[9, +oo)
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