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satela [25.4K]
3 years ago
11

Please help

Mathematics
2 answers:
Gnesinka [82]3 years ago
6 0

sales tax = $60x0.07=$4.20

$60-$4.20=$55.80

tip = $60x0.15=$9

overall, $55.80+$9=64.80$ - total cost

not sure, but i think that's the way you do it

victus00 [196]3 years ago
5 0
$75 :) you just had to add the normal price and tip
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Determine whether 81 − 49n4 is a difference of two squares. If so, factor it. If not, explain why.
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We have

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making the answer D.

We can further factor the first term here and write

9-7n^2=3^2-(\sqrt 7\,n)^2=(3-\sqrt7\,n)(3+\sqrt7\,n)

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Let's say, first we have to eliminate Z:
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At the end you will find:
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