Formulas To Memorize

Question 1

Vertex of a parabola

Answer 1

(h, k)

Question 2

Equation of a parabola which opens up or down

Answer 2

(y-k) = +/- 1/4p (x-h)^2

Question 3

Equation of a parabola that opens right or left

Answer 3

(x-h) = +/-1/4p (y-k)^2

Question 4

Equation for exponential growth/decay

Answer 4

y= a•b^x

Growth: b>1
Decay: b<1

Question 5

Growth/decay formula

Answer 5

y = a(1+/-r)^t

Question 6

Compounded interest formula

Answer 6

y=a(1+r/n)^nt

Question 7

Continuous growth formula

Answer 7

y= Pe^rt

Question 8

Half life formula

Answer 8

y=a(1/2)^t/H

Question 9

Trigonometry pi

Answer 9

1 Pi= 180 degrees
2 pi= 360 degrees
So, pi/2 is 180/2

Question 10

Unit circle sin0 and cos0 and tan0

Answer 10

sin0= y
cos0= x
tan0= y/x

Question 11

Radian formula

Answer 11

0radians= s/r

0 radians = (arc length)/ (radius)

Question 12

Trigonometric graph formula

Answer 12

y=a•sin•b(x-d)+c

A= amplitude
B= finds the period (period= 2pi/b)
C= shift up or down
D= shift right or left

Question 13

Recursive formulas

Answer 13

A1=

ARITH
An= an-1 +d

GEO
An= an-1•r

Question 14

Independence formulas prob

Answer 14

P(A) • P(B) = P(AnB)
P(A)= P(A|B)

Question 15

Prob OR formula

Answer 15

OR= P(A)+P(B)-P(AnB)

Question 16

Prob GIVEN formula

Answer 16

P(A|B)=P(AnB)/P(B)

Question 17

Confidence interval

Answer 17

mean+/-2(SD)

Question 18

Calculating margin of error

Answer 18

2(SD)

Question 19

Inverse equation

Answer 19

Switch x and y, solve for y
f^-1(x)

Question 20

Center radius formula

Answer 20

(x-h)^2+(y-k)^2 =r^2

Question 21

Calculating average rate of change

Answer 21

Slope formula
y2-y1/x2-x1

Question 22

as sample size increases, what happens to margin of error

Answer 22

margin of error decreases