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Andy C.'s Resources

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20 = (2r+5)*t   8 = r * t   20/(2r+5) = 8/r   20r = 8(2r+5) 20r = 16r + 40   4r = 40   r=10     Bike: 8 mi = 10 mph*t              4/5 = t  ...

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story problem (answer)

x + x+2  + x+4 = 105   3x + 6 = 105   3x = 99   x=33   33, 35, and 37

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   Given:   n>=2; A and b are square nxn matrices; 0n  is the nxn zero matrix;     (b)      Given: A^2 = 0n;               Prove: I - A is invertible and it's inverse is I + A  ...

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