Required Formulas Flashcards
1
Q
Compound Growth/ Decay (Compound interest)
A
N= N₀(multiplier)ⁿ amount after X years= initial amount x (percentage change)^years
2
Q
Area of a trapezium
A
1/2(a+b)h average of parallel lines x vertical height
3
Q
Quadratic equation
A
4
Q
Pythagoras’ Theorem
A
a^2+b^2 = c^2
5
Q
Sine rule
A
6
Q
Cosine rule (sides)
A
7
Q
Cosine rule (angles)
A
8
Q
P(A u B)
A
P(A) + P(B) - P(A n B) Elements in both sets including intersection
9
Q
P(A n B)
A
P(A) x P(B given A) = P(A) x P(B \ A) Intersection of the 2 sets
10
Q
Area of a triangle
A
1/2 a b sinC
11
Q
P (A u B) in a mutually exclusive set
A
P(A) + P(B)
12
Q
Mean in a frequency table
A
Σfx / Σf
f= the midpoint
13
Q
Cone volume
A
1/3 π r^2 h
14
Q
Sphere volume
A
4/3 π r^2
15
Q
Quadratic equation
A
ax^2 + box + c = 0
