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a photo processing lab lists the following prices for reprin

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a photo processing lab lists the following prices for reprints :29cents for a 3*5 print ; 39 cents for 4*6 print:and 55 cents for a 5*7 print
find a quadratic function of the form f(x)=ax平方+bx+c that models the cost (in cents) per print in terms of the smaller dimension of the size
a photo processing lab lists the following prices for reprin
代入点(3,29)(4,39)(5,55),解得a=3,b= -11,c= 35
Thus,the function is f(x)=3x^2-11x+35.
其实这题很简单,大概是因为你没有注意后面那个“smaller dimension”.这题我好像刷到过.
最后祝SAT加油!