Formulas Flashcards
What is the formula for combination
N!/(n-r)!r!
- n= # of objects
- r = # of choosing
What is the for permutation?
N!/(n-r)!
*! Means multiply all numbers till you reach 0.
Volume of a sphere
V= 4/3(pi) times r cubed
Percent of change
Amount of change over the original
To find reflection on graph…
(x,y) = (x,-y)
Translation(slide)on a graph…
Slide
Dilation
Enlarge or reduce
To rotate on a graph…
Rotate X and Y and make Y negative
F(x) means…
Y
Horizontal slope?
0
1/0 slope?
Vertical( can’t define)
Formula for slope
Y2-y1/x2-x1
Slope intercept form
Y= mx+b
Point slope form
* use to find y intercept
Y-y1=m(x-x1)
Standard form
AX +by= C
* a can’t be negative
No fractions!
In standerd form how you find slope and y intercept
-a/b
C/b
Perpendicular lines slope
Negative reciprocal
Line of best fit
Find slope
< wich way to shade
Left
> shading?
Right
When solving absolute value equations use…
|x- middle value | a sign half distance
Y<
Shade below
Y>
Shade above
X<
Shade left
X>
Shade right
