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

Rated/t (distance)/(time)

Time(distance)/(rate) d/r

How do you solve proportions? a/b=c/dCross multiplication a/b=c/d 4/6=10/15 4(15)=6(10) 60=60

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%

The percent decrease of a quantity= (actual decrease/Original amount) x 100%

If a lamp decreases to $80, from $100, what is the decrease in price?= (actual decrease/Original amount) x100% = 20/100x100% = 20%

To increase a number by x%multiply by 1+x% i.e. 100 x (1+50%)=100x1.5=150

To decrease a number by x%multiply by 1x% i.e. 100 x (150%)=100x.5=50

THE DENOMINATOR CAN NEVERBE ZERO! 1/∅=null

If a>b thena<b

The reciprocal of any nonzero number is1/x

Probability of an EventP(E) = number of favorable outcomes/total number of possible outcomes

If Event is impossibleP(E) = ø

If E is certainP(E) = 1/1 = 1

Probability of Event all cases∅≤P(E)≤1

Probability of E not occurring1  P(E)

Circumference of a circlepi(diameter)

Circumference of a circle2(pi)r

Area of a circle(pi)r²

Volume of a rectangular solid(length)(width)(height)

Volume of a cubeedge³
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