1
Q
vertex form
A
y=a(x-h)^2+k
2
Q
y=a(x-h)^2+k
A
(h,k) = (x,y)
a = opens up
-a = opens down
3
Q
distance formula
A
d=(sr(x2-x1)^2 + (y2-y1)^2)
4
Q
quadratic formula
A
y=(-b+(sr b^2-4ac))/2a
5
Q
exponential growth/decay
A
y=a(1+-r)^x
6
Q
y=a(1+-r)^x
A
r=rate as decimal
a=initial
7
Q
Simple interest
A
A=Prt
8
Q
A=Prt
A
P=initial
r=interest rate (decimal)
t=time
9
Q
Compound interest
A
A=P(1+(r/n))^nt
10
Q
A=P(1+(r/n))^nt
A
P=initial
r=interest rate
t=time
n=times interest compounds in 1t
11
Q
equilateral triangle
A
A=((sr3)/4)s^2
12
Q
A=((sr3)/4)s^2
A
A=area
S=side length
13
Q
Circle equation
A
(x-h)^2+(y-k)^2=r^2
14
Q
(x-h)^2+(y-k)^2=r^2
A
(h,k) = center of circle
r=radius
15
Q
regular polygon interior angle
A
((n-2)180)/n
16
Q
((n-2)180)/n
A
n=number of sides
17
Q
arc length
A
(central angle/360)pi d
18
Q
sector area
A
(central angle/360)/pi r^2
19
Q
mean
A
average
20
Q
median
A
middle most
21
Q
mode
A
most often
Spanish 4: 24-25
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