7th Grade Math
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Find the $2 \times 2$ matrix $\bold{A}$ such that \[\bold{A} \begin{pmatrix} 1 \\ 0 \end{pmatrix} = \begin{pmatrix} 1 \\ 2 \end{pmatrix}\] and \[\bold{A} \begin{pmatrix} 0 \\ 1 \end{pmatrix} = \begin{pmatrix} 7 \\ 4
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asked by Kimberly on October 15, 2006 
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If no digit can be used more than once, how many 5digit numbers can be formed only using the numbers 3,8,1,2,5, and 7? A: 350 numbers B: 717 numbers C: 722 numbers D: 720 numbers I guessed the answer 720 and got it right but I
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Word problem: The sum of two numbers is 26.4. One number is five times the other number. Find the numbers. It's probably: x+y=26.4 x=5y But, I could be wrong and I don't know where to go from there.
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