Answer:
sry I just wanted the points I'm in middle school so I don't know this stuff either
[|] Answer [|]

[|] Explanation [|]
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Convert Fractions To Mixed Numbers:
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Multiply Across:

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Simplify:
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The one that you have marked in the picture is right because you are taking away two hours and dividing 400 by s
In each case divide the price by the number of cans.
The best buy is the lowest price.
$12.53/7 = $1.79
$5.97/3 = $1.99
$7.95/5 = $1.59
$8.34/6 = $1.39
The fourth ad, $8.34 for 6 cans results in the lowest price per can, $1.39.
The fourth ad is the best buy.