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Colt1911 [192]
3 years ago
14

Joe was promised $22.00 and a new CD for taking care of a neighbor’s dog for 7 days. But when the neighbors came home after just

5 days, Joe got the CD and only $14.00. What was the value of the CD?
Mathematics
1 answer:
svp [43]3 years ago
6 0

Just a guess! Since he was paid $8 less, it is fair to assume the CD was worth $8.

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Use a matrix to solve the system:
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(2.83 , 1 , 4)

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A^{-1}=\left[\begin{array}{ccc}7/15&1/6&-1/5\\1/3&-1/6&0\\3/5&0&-2/5\end{array}\right]  \\

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X=A^{-1}B\\\\\left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}7/15&1/6&-1/5\\1/3&-1/6&0\\3/5&0&-2/5\end{array}\right]\left[\begin{array}{ccc}4\\2\\-4\end{array}\right] \\\\\\\left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}2.83\\1\\4\end{array}\right] \\

4 0
3 years ago
Meranda works for 7 hours at 10.25 per hour how much does she earn ?
frosja888 [35]
You take how much she makes and multiply it by the hours she works
 10.25*7
=71.75
5 0
3 years ago
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