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### 35 Cards in this Set

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 Formula for % increase * Formula for % decrease Where X=the base What does this equal? answer What does this equal answer x^2-2xy+y^2= (x-y)^2 sales price = (original price) - (%discount)(original price) total price (#of items) cost Distance Rate x time 30:60:90 triangle 1:2:square rt of 3 45:45:90 triangle leg ratios 1:sr of 2 Pi = approx 3 nCk n! / k!(n-k)! Av Speed = TD / TT P(AorB) P(A)+P(B)-P(A&B) W/ probab how do you handle exclusions? Divide factorial of # of events y the product of the exclusions 10% of 30% .10x.30 Volume of Rectangle Solid LxWxH Sum of terms = Average x # of terms Slope = Rise / run y2-y1 / x2-x1 neg slope = \ pos slope / STD = Avg of array (find mean) diff btwn each & mean Square differences Find mean of squared differences Probability formula # favorable outcomes / # possible outcomes 6C2 15 4C2 4 16C4 = 16C12 = multiple of 3 sum of digits is multiple of 3 multiple of 4 last two digits is a multiple of 4 multiple of 6 sum of digits is a multiple of 3 and last digit even multiple of 9 sum of digits is a multiple of 3 and sum of last two digits are multiple of 4 ie 135 % formula = part = percent x whole Percent increase = amount of increase / original whole then x 100 Percent decrease = amount of decrease / original whole then x 100 What is the average formula avg = sum / # of terms sum = avg x # of terms Avg of evenly spaced #s avg of min + max How do you count consecutive numbers? Max - Min +1 Ratio formula ratio = of / to