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