Question 361399
ALL of the below have to be memorized, its alot all at once but you will learn these all over time. and they are all rather easy once you start using them everyday.

First basics is order of operations
"Please Excuse My Dear Aunt Sally" or (PEMDAS) which means:
Parenthesies
Exponents
Multiplication
Division
Adding
Subtracting
ex: {{{(((2+3)^2*2)/10)+1-6=y}}} Answer:{{{y=0}}}
Work P:{{{2+3=5}}} , E:{{{5^2=25}}} , M:{{{25*2=50}}} , D:{{{50/10=5}}} , A:{{{5+1=6}}} , S:{{{6-6=0}}}
<p>
The distributive property
taking the number outside the parenthasies and multiplying it in to the variables or numbers inside.
{{{2(x+y)=2x+2y}}}
{{{x(3+y)=3x+xy}}}
<p>
Associative Property 
For addition, the rule is {{{a + (b + c) = (a + b) + c}}}; in numbers, this means  {{{2 + (3 + 4) = (2 + 3) + 4}}}. For multiplication, the rule is {{{a(bc) = (ab)c}}}; in numbers, this means {{{2(3*4)=(2*3)4}}} 
<p>
Commutative Property     
For addition, the rule is {{{a + b = b + a}}}; in numbers, this means {{{2 + 3 = 3 + 2}}}. For multiplication, the rule is {{{ab = ba}}}; in numbers, this means {{{2*3 = 3*2}}}
<P>       
Laws Of Exponents   
{{{x^a*x^b=x^(a+b)}}} , {{{x^2*x^3=x^5}}}  
{{{(x^a)^b=x^(ab)}}} , {{{(x^2)^3=x^6}}}
{{{(xy)^a=x^ay^a}}} , {{{(xy)^2=x^2y^2}}}
{{{x^(-a)=1/x^a}}} , {{{x^(-2)=1/x^2}}}
<p>
FOIL Method
{{{(a+b)(c+d)}}}
First numbers
{{{a*c}}}
Inner numbers
{{{b*c}}}
Outer numbers
{{{a*d}}}
Last numbers
{{{b*d}}}
<p>
Quadratic Equation and formula
equation:{{{ax^2+bx+c=0}}}
Formula in words: opposite of b Plus or minus the squareroot of b squared minus four times a times c all over 2 times a
Formula looks like: {{{(-b+-sqrt(b^2-4ac))/2a}}}
<p>
Pythagorean Theorem
{{{a^2+b^2=c^2}}} Where a and b= the 2 small sides of a triangle and c is the hypotenuse.
<p>
(L=Length W=Width H=Hieght S=Side)
Perimeter of a rectangle
{{{P=2(L+W)}}} or {{{P=2L+2W}}}
Area of a rectangle
{{{A=LW}}}
Volume of rectangle box
{{{V=L*W*H}}}
Surface area of a cube
{{{A=S^2*6}}}
Volume of a cube
{{{V=S^3}}}
<p>
Slope Intercept form
(m=slope b=y-intercept)
{{{y=mx+b}}}
{{{y=(2/3)x+4}}} slope is 2/3 , y-intercept is 4
Finding Slope from 2 points
(x1,y1)(x2,y2)
{{{m=(y2-y1)/(x2-x1)}}}

I Hope all these help
Good Luck