# SAT MATH (copy)

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## Description and Tags

### 220 Terms

1

vertex

min or max pt in parabola

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2

minimum point

open upward

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3

maximum point

opens downward

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4

b2 minus 4 ac equals 0

1 solution

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5

disciminant

b2 minus 4 ac

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6

discriminant is negative

no solution

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7

discriminant is positive

2 solutions

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8

standard form shows

shows where parabola opens and c= y int

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9

positive a in parabolic formulas

opens up

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10

negative a in parabolic formulas

opens down

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11

factored form shows

shows x intercepts

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12

vertex form shows

shows vertex

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13

standard formula

ax2 plus bx plus c

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14

vertex formula

a (x-h)2 plus k

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15

factored formula

a (x-b)(x-c)

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16

f(x-c) shift

right c units

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17

f(xplusc) shift

left c units

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18

f(x) plus c

up c units

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19

f(x) - c

down c units

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20

-f(x)

change in y

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21

f(-x)

change in x

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22

linear equation

y=mx+b

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23

distance formula

d = √[( x₂ - x₁)² + (y₂ - y₁)²]

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24

x = -b ± √(b² - 4ac)/2a

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25

Sum of Perfect Squares (a+b)2

(a2 + 2ab +b2

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26

Sum of Perfect Squares (a-b)2

a2 -2ab +b2

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27

dif of perfect square (x2-y2_

(x+ y) (x-y)

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28

x22/x10

x12 (subract divisions)

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29

x3 times x4

x7 (sum multiplications)

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30

(x3)4

x12 multiply exp exp

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31

x-n NEGATIVE EXP RULE

1/xn

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32

neg exp rule 10-2

over 1, reciprocal (switch to 1/10) and pos exp, square base with positive 2! (exp) 1/10 2 = 1/100

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33

fractional exponent 8^2/3

3 square root 8^2 3 cube root of 64

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34

every number over 1/3

cube root rulez

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35

square of x7

x 7/2

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36

25^-3/2

1/25^3/2 = 1/(25^1/2)3

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37

16^5/4

(16^1/4)5

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38

standard deviation

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39

average/mean

sum divided by amt

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40

median

middle or 2 middle (do mean)

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41

mode

most repeated

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42

#A=IrT

I is initial valute , times rate, over time

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43

compound interest

Interest paid on interest previously earned; credited daily, monthly, quarterly or semiannually

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44

interest

A sum paid or charged for the use of money or for borrowing money

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45

a= I (i plus or minus r/n) ^ntimes t

n= number of times interest was compounded

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46

hipotenusa

c2 equals a2 plus b2

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47

right trig?

sohcahtoa

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48

circle formula

(x-h)^2 + (y-k)^2 = r^2

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49

circle area

A=πr²

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50

Circle Circumference

C=2πr

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51

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52

multiply by pi/180

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53

same slope, different y-intercept

parallel lines/ no solution

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54

Same slope, same y-intercept

infinite solutions same line

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55

Different slope, different y-intercept

one solution

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56

square area

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57

rectangle area

A=lw

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58

triangle area

A=1/2bh

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59

over x axis

(x,y) -> (x,-y)

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60

over y axis

(x,y) -> (-x,y) (reflection)

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61

range

the difference between the highest and lowest scores in a distribution

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62

wp strat

1- read question slowwww and annotate 2- read bite by bite and annotate skim extra 3-rewrite and eliminate 4- find correct answer

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63

volume of a cylinder

area of base x height// base -- pir2

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64

circle problem

put x, 2x and equal that to total

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65

geometry?

1- pithagoras- r triangles 2- sohcatoa - r triangles 3- circles: remember formulas and rules, apply x/2x strat equalling to total same with any shape^^

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66

break even

profits=costs

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67

every linear equation is

a modification of y=x

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68

rate

a measure, quantity, or frequency, typically one measured against some other quantity or measure. eg change in distance over time

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69

wp strat 2

calculate rate. change in y over x/// y2-y1/x2-x1

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70

linear relationships

A relationship that has a straight line graph standard or slope intercept clasique

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71

y int?

plug in all values and calculate for b in formula, m and random x,y valur

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72

quad wp max or min point

find vertex (hk)- factored form

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73

area of a rectangleeeee

btimesh

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74

triangle

b x h / 2

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75

A​=ℓw=x(x−2)​

always xx order rule

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76

P(t)=P(1+r)t=

tt is the input variable representing the number of time periods elapsed. P is the initial amount of money, or the amount of money before any interest is accrued. r is the interest rate applied for each time period expressed as a decimal.

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77

decimal to percent eg 1.01 (added 1 in formula)

1 plus or minus rate, then multiply times 100 for percent change from decimal to %!!!!= 1

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78

in a t/7.3 exponential word problem...

t indicates how in 7.3 over 7.3 = 1 , the values b4 it willl lose or gain () value.

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79

exponent conversion to smaller unit wp eg

Tip: If converting the variable from a larger time unit to a smaller time unit, we need to make the exponent smaller. For example, when converting from years to months, we divide the variable representing the number of months by 121212.

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80

exponent cnversion to bigger unit wp eg

Tip: If converting the variable from a smaller time unit to a larger time unit, we need to make the exponent larger. For example, when converting from months to years, we multiply the variable representing the number of years by 121212. Verify that the two expressions give us the same values when evaluated using equivalent amounts of time, e.g., 111 year and 121212 months, 222 years and 242424 months, etc.

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81

nearest whole number

redondear

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82

if a wp gives you that the rate is blah blah for every increase in blah blah that means they are giving u..

the m value (put number over number in fraction form)

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83

alwayyss

2x check or put in review (guessed)

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84

lin eq wp

1-read slowly 2-annotate along the way words to math!!

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85

of

multiply

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86

per

divide

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87

shortcut what is 25% OF 364

91! (TURN INTO DECIMAL-- MULTIPLY)

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88

PERCENT CHANGE

old-new/old x 100

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89

round to nearest tenth eg:

0.4

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90

always

focus on problem, skip if too timeconsuming remember strat

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91

percent strats

1- rule of 3 2- % change formula 3- equations eg: h=.75a etc

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92

x1 plus x1

2 x 1

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93

polynomials factoring

biggest possible numbers and variables

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94

inequalities with absolute values

isolate absolute valuek, resolver cmo en escuela

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95

no idea in linear equations??

if value eg 15,0 (plug x for 15, 0 in y and get letter strat)

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96

geometry strat 2 congruence

check for what the problem is telling u: equilateral, isosceles

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97

ax2 plus bx plus c method

calculator or::

multiply for ac not just c substract/sum b!!! take into mind- product si es negativo uno es positivo!!

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98

similar triangles

same ratios! --corresponding angles,etc

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99

congruent triangles

2 triangles are congruent if and only if all pairs of corresponding sides and angles are congruent / equals. rotate and match to find angle

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100

graph equations

check if every answer is right (not just for 1)

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