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MAT 113: FINAL EQUATIONS
absolute change
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newer function value- older function value
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relative change (percent change)
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newer function value-older function value/older function value x 100
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average growth rate
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newer function value-older function value/newer independent value-older independent value
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interpolation
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first value+ average growth rate value x number of years
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extrapolation
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ending value+ average growth rate value x years
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inflation (number not percent)
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new$= (old$)(1+r)
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linear function
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(y2-y1)/(x2-x1)=slope, then solve for b
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exponential function
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y=mx+b
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magnitude of earthquake
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log(relative intensity)
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relative intensity of an earthquake
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10^(magnitude)
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decibels of sound
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10 log (relative intensity)
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relative intensity of sound
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10^(.1xdecibles)
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volume of a cylinder
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V = πr2h
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Margin of error
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100/square root of sample size
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Z score
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Number-mean/standard deviation=answer - 100
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