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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^22xy+y^2=

(xy)^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!(nk)!


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
y2y1 / x2x1 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
