Common math Formula's 2

Question 1

what can you do if the signs are the same for an inequality

Answer 1

Add them shits to eliminate if the signs are the same

Question 2

What do you do to an inequality if the you are multiplying or dividing by a negative number

Answer 2

FLIP THE SIGN YA BISH

Question 3

how do you multiply fractions

Answer 3

(toptop)/(bottombottom)

Question 4

how do divide fractions

Answer 4

multiply by the reciprocal AKA flip and multiply

Question 5

Extreme tails (out liar numbers) affect what more: the mean or the median?

Answer 5

Mean

Question 6

What are the two roots in quadratic Foilng/unfoiling

Answer 6

add to the first one, multiply to the second one

Question 7

how do you calculate the probability of multiple events

Answer 7

multiply their respective probabilities

Question 8

How do you calculate probability of more than one way to win

Answer 8

add up their probabilities

Question 9

normal distribution - where are the mean and median?

Answer 9

mean and median are both in the middle

Question 10

Normal distribution: What are the three ticks marks on either side of the mean/median

Answer 10

34, 13.5, 2.5

Question 11

Third side rule for triangles

Answer 11

The legnth of any side of a triangle must be greater than the difference (subtraction) between the other two sides and less than the sum (addition) of the other two sides

Question 12

Standard deviation: if you multiple all numbers in a set by X - what happens to Standard deviation

Answer 12

SD ALSO gets multiplied by X - [bc spacing between the numbers gets multiplied by X].

• also, mean gets multiplied by X
• add or subtracting does nothing to any of the information

Question 13

If all numbers in a set are identical, then what is the Standard deviation? Why?

Answer 13

SD=0, bc SD is a measure of the distance between data points in a set

Question 14

How does the following impact Standard Deviation: Lots of points close to mean vs lots of points far from the mean

Answer 14

Close to mean = small SD

Far from mean = large SD

Question 15

SD: if you have only summary data (mean and SD) and you add new values - how do you calculate the SD?

Answer 15

you cannot calculate the SD

Question 16

SD: Which two numbers added to an existing data set would decrease the Standard deviation the most?

Answer 16

Adding data points that are equal to the mean (as they are both zero away from the mean, as such decrease the SD the most)

Question 17

(-#)^[even #] = what generally

Answer 17

(Negative number) ^ (Even number) = ALWAYS equals a positive number

Question 18

(a/b)^[-c] can be written as:

Answer 18

(b/a)^[+c]

Question 19

What makes a fraction “undefined”

Answer 19

a denominator of ZERO

Question 20

formula for concentration

Answer 20

concentration:

[(amount of solute)/(total solution amount)]*100

Question 21

Formula for total degrees of angles within a polygon

Answer 21

180(N-2), where N is number of sides

Question 22

Probability ALWAYS has to be a measure between what range of digits?

Answer 22

ZERO and ONE

*therefore anything above one is always a greater number than the probability of a given event, even if it is 100% likely (bc that equals a probability of 1)

Question 23

Combination formula and equivalent

Answer 23

nCr (n = total pool; C=”Choose”; R=number of people we are choosing)

nCr = nC(n-r)

Question 24

when order doesn’t matter in a combination what do you do?

Answer 24

divide by R! (RE factorial)

Rr-1etc

Question 25

the sum of any two sides of a triangle must be _____? than the third side.

Answer 25

the sum of any two sides of a triangle must be greater than the third side.

Question 26

Slope equation

Answer 26

Rise/Run (Y/X)

Question 27

rate formula

Answer 27

distance/time