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Space Race
Defend Earth from alien invaders
probability of an event
when number of favorable outcomes is divided by number of possible outcomes

Experimental probability
number of successes divided by the number of tries

Simple interest
I=Prt where the principal times rate (written as a decimal) times "time in years"

Compound interest
A = P(I +r)squared : where A is the balance, P is the principal, r is the annual interest rate (written as a decimal), and t is the time in years

Distance formula
Distance between two points in a coordinate plane is equal to the square root of the sum or the horizontal change squared and the vertical change squared.

Midpoint formula
Coordinates of the midpoint of a segment are the average of the endpoints x-coordinates and the average of the endpoints' y-coordinates.

Slope formula
difference of y-coordinates divided by difference of x-coordinates

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