SAT PREP and ACT

whats a linear equation and which one is the slope and which is the intercept also slope intercept form

y=mx+b (ALWAYS CHANGE IT TO THIS) m is the slope, y is the intercept

what is vertex form

a(x-h)² +k

quad formula and it has to be in what form?

-b+- √(b²-4ac) / 2a ax²+bx+c=0

expontienal growth

y = a(1 + r)^t

Percentage change?

New-Old/old X 100%

If you are given 2 points (X1, X2) (Y1,Y2) and need to find the slope

(Y2-Y1/X2-X1)

Midpoint formula

(X2+X1/2 (Y2+Y1)/2

If given 2 points find the distance, so distance formula

d = √((X2-X1)² + (Y2-Y1)²)

Length of an Arc

(2πr)(degree measure of arc/360 degrees)

Length of an arc sector

(πr²)(degree measure of arc/360)

Complete the square

x2+x+_=x+_ (HAS TO BE X²)

Average speed formula

Speed=total distance/ total time

Mean formula

Mean=Sum of terms/ number of terms

Probabilty of outcomes formula

Probabilty of outcome=number of favorable outcomes/ total number of outcomes

Find x percent of a number

N(x/100)

What percent a number is of another number

(n100/x)

Find out what a number is x percent of

(n100/x)

Sin

SOHCAHTOA

Tin

SOHCAHTOA

Cin is what?

SOHCAHTOA

Standard form

Ax+By=C

Point-slope form

y-y1=m(x-x1)

Area of a triangle and permiter

A=1/2bh, P=a+b+c

Area of a square and permiter

A=s² P=4xS

Rectangle area and Perimeter

P+2l+2w A=lw

Circle curicumrance/perimeter and area

A=πr² P=2πr

Rectangle that’s soild find volume and surface area

V=Lwh SA=2lw+2lh+2wh

Center-Radius form

(x-h)²+(y-k)²=r

Area of a circle

A= πr²

Circumference of a circle

C=2πr

Area of sector

A=0/36PieR²

Pythagorean Theorem when needed to find an unknown side of a length

a²+b²=c²

What if you l-14l

it is always positivity