Transcription of NUMBER AND QUANTITY - ACT
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NUMBER AND QUANTITY - ACT
ACT FORMULA SHEETMATHan = a1 + c(n 1)an = a1(c)n 1 NUMBER AND QUANTITYS equencesLogarithmsRatesSequence with a constant of c:arithmetic sequence:geometric sequence:distance = speed timevariation: QUANTITY = rate timelogab = c ac = bSTATISTICS AND PROBABILITYP ercentsStatisticspercent = part / whole 100%% symbol = divide by 100a% of b = a/100 b = a b/100percent change = change / originalaverage (mean) = sum of terms / NUMBER of termsmedian = middle NUMBER (or average of 2 middle numbers)mode = most common numberrange = biggest smallestProbability and Counting Techniquesprobability = NUMBER of desired terms / total NUMBER of termsP(event happens) + P(event doesn t happen) = 1P(A and B) = P(A) P(B)
ACT FORMULA SHEET MATH an = a1 + c(n – 1) an = a1(c)n – 1 NUMBER AND QUANTITY Sequences Logarithms Rates Sequence with a constant of c: arithmetic sequence: geometric sequence: distance = speed × time variation: quantity = rate × time log a b = c ˜ ac = b STATISTICS AND PROBABILITY Percents Statistics percent = part / whole × 100% ...
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