Math SAT Memorization

everything you need to memorize for math

Positive Discriminant

Two Real Solutions

Negative Discriminant

No Real Solutions

Discriminant Equals 0

One Real Solution

If growth is percent of the total population

Final amount = original amount (1 ± rate)^number of changes

If growth is a multiple of the total population

inal amount = original amiunt (multiplier)^number of changes

Increase by a %

Multiply , then add

Decrease by a %

Multiply, then subtract

Discounts

Multiply, then subtract

Sales Tax

Multiply, then add

Income Taxes

Multiply, then subtract

Interest

Multiply, then add

Vertex Form

y=a(x-h)²+h

vertex in vertex form

(x,h)

standard form

Ax+By = C

finding slope in standard form of a quadratic function

- A / B

finding y-intercept in standard form of a quadratic function

C / B

what do similar triangles have in common

angles

distance formula

what is the mean

average

what is the median

the middle number

what is the mode

the most repeated number

equation of a circle

(x – h)²+ (y – k)² = r²

arc length if in degrees

s = 2 π r (θ/360°)

arc length if in radians