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Sedaia [141]
3 years ago
15

PLS HELP!! I AM COMPLETELY STUCK! 50 POINTS! Mrs. Bull spilled coffee on her computer during the first week of school! the total

cost after tax to repair it is represented by 0.09(75h) + 75h, where h represents the number of hours it takes to repair her computer. What part of the expression represents the amount of tax Mrs. Bull has to pay? I need the total tax that she paid, and please explain it! Thank you!
Mathematics
2 answers:
Leona [35]3 years ago
6 0

0.09(75h) is the part of the expression that represents the amount of tax Mrs.Bull has to pay. 75h (h representing the number of hours it will take to repair the laptop) is the amount before tax, so 0.09 and 75h multiplied will equal the total of tax.


Hope this helps you

Vlad [161]3 years ago
3 0
I’d say that the repair costs 75$/hour which then leaves the tax to be 0.09

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Find the inverse of this matrix.<br> 1 -1 -1<br> -1 2 3 <br> 1 1 4
zheka24 [161]

Let's use Gaussian elimination. Consider the augmented matrix,

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\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\0 & 1 & 2 & 1 & 1 & 0\\0 & 2 & 5 & -1 & 0 & 1\end{array}\right]

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\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\0 & 1 & 2 & 1 & 1 & 0\\0 & 0 & 1 & -3 & -2 & 1\end{array}\right]

• Add -2 (row 3) to row 2:

\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\0 & 1 & 0 & 7 & 5 & -2\\0 & 0 & 1 & -3 & -2 & 1\end{array}\right]

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So the inverse is

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3 years ago
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<h3>Answer:     Negative</h3>

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