GRE: Math3
GRE Math3 Flashcards - Most Studied - #7,9,10,12 I deleted ones that didn't make sense
Kalvin
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Distance(rate)(time) d=rt
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Rated/t (distance)/(time)
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Time(distance)/(rate) d/r
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How do you solve proportions? a/b=c/dCross multiplication a/b=c/d 4/6=10/15 4(15)=6(10) 60=60
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If a lamp increases from $80 to $100, what is the percent increase?= 25%. = (actual increase/original amount) x 100% = 20/80 x 100% = 1/4 x 100% = 25%
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The percent decrease of a quantity= (actual decrease/Original amount) x 100%
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If a lamp decreases to $80, from $100, what is the decrease in price?= (actual decrease/Original amount) x100% = 20/100x100% = 20%
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To increase a number by x%multiply by 1+x% i.e. 100 x (1+50%)=100x1.5=150
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To decrease a number by x%multiply by 1-x% i.e. 100 x (1-50%)=100x.5=50
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THE DENOMINATOR CAN NEVERBE ZERO! 1/∅=null
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If a>b then-a<-b
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The reciprocal of any non-zero number is1/x
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Probability of an EventP(E) = number of favorable outcomes/total number of possible outcomes
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If Event is impossibleP(E) = ø
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If E is certainP(E) = 1/1 = 1
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Probability of Event all cases∅≤P(E)≤1
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Probability of E not occurring1 - P(E)
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Circumference of a circlepi(diameter)
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Circumference of a circle2(pi)r
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Area of a circle(pi)r²
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Volume of a rectangular solid(length)(width)(height)
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Volume of a cubeedge³
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