ACT Notes Flashcards
Who ->
Whem ->
he/she
him/her
How to do matrices on calculator
2nd -> matrix -> edit, make the matrixes
Go back to home screen
2nd -> matrix -> select which one you want to do
Area of a circle
(Pi)r^2
Circumference of a circle
2(pi)r
How to rewrite x ^ 2/5
5(sq rt) (f^2)
Geometric Sequence
a -xn-> b -xn-> c -xn-> d
Equation: (nth term) = (first term) x (common ratio)^(term position-1)
Arithmetic Sequence
(nth term) = (first term) + ((term position) - 1)(common difference)
Equation of an Ellipse
(x^2/a^2) + (y^2/b^2) = 1
Ellipse Equation
Horizontal Stretch:
Vertical Stretch:
a^2 > b^2, then horizontal stretch
b^2 > a^2, then vertical stretch
Equation for focal length
f^2 = p^2 - q^2
p = major radius
q = minor radius
Discriminant
“How many solutions are there?”
b^2 = 4ac
- If result = positive, then 2 real solutions
- If result = zero, then 1 real solution
- If result = negative, then 0 real solutions
SIN COS TAN Equations
Store x & plug into calculator
Check all 5 answers
Distance equation
rate x time = distance
Expected Value Equation
Total possible points / # of chances
Cos Equations
sides = A,B,C
c^2 = a^2 + b^2 - 2ab (cos(whatever angle is opposite c))
