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