The Official (CollegeBoard) SAT Math 1 - Practice 2
注意raw score 不是做对题的数目，要减去错的题数 ×0.25。做对45道题，做错5道题。
45 － 5×0.25 = 44, 分数750. 。几乎都是粗心。
Errors: Q9: radius not diameter Q19 Q23 Median vs. Mean Q35, Q36
Q8: as many as
Somehow, I was distracted by 1/2, think it should be ( x - ½) 2
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