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Flashcards in Math review Deck (21):
1

any integer divisible by 2

is even integer

2

any integer not divisible by 2 is

odd integer

3

if at least one factor is even, the the product is

even

4

if both are odd, then product is

odd

5

if both integers are even or odd, then sum/differene is

even

6

if one integer is even and other is odd, then sum/difference is

odd

7

sum of the interior angles of a polygon equation

(n-2)180

8

distance =

rate *time

9

working together or alone rate problem formula:

1/r + 1/s = 1/h
each variable is in hours

10

interest problem: simple annual int formula

princ * interest rate * time

11

gross profit =

revenues - cost

12

pi =

3

13

sq rt (1)

1

14

sq rt(2)

1.4

15

sq rt(3)

1.7

16

sq rt(4)

2

17

Permutation, single source, order matters

for a problem that asks you to choose from the same source to fill specific spots, all you have to do is multiply the number of choices for each of the spots - but the number of choices keeps getting smaller.

3 basketball teams play in a league against each other. At the end of the season, how many different ways could the 3 teams end up against each other?

3*2*1 = 6

18

permutation =

arrangements

19

combination =

groups

20

6 horses in race. how many different groups of horses make up the top 3 horses?

groups = combination
n! / r! (n-r)!

6! / 3! * 3!

21

percent change

difference/original * 100