Other Formulas Flashcards by Racheli Katz | Brainscape

Q

Speed Formula

A

Speed=distance/time

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Q

Sum of interior angles

A

Triangle trick or 180(n-2) (N=sides of a polygon)

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Q

Combinations

A

n!
r!(n-r)!

(Can’t repeat)

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Q

Permutations

A

n!
(n-r)!

(Can repeat)

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Q

Quadratic equation

A

X= -b +- _/b-4ac
2a

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Q

Simple interest formula

A

V=P(1+rt/100) (Based on initial deposit)

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Q

Compound interest formula

A

V=P(1+r/100n)^nt

(Interest regularly added to new value)

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Q

Equation of graphed circle

A

(x-a)² +(y-b)² = r²

R=radius

(a,b)= center of circle: negatives flip

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Q

Arc length

A

Arc Length=(n/360)(circumference)

*n/360 = arc/circ = area of sect/area of circle

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