sat II math 1
Terms
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- integers are
- whole #s
- exponential growth:
-
Sn= first term - nth term
divided by
1 - ratio between consecutive terms - union of elements (U)
- elements that are in either or both
- intersection of elements (N)
- common to both sets
- relative primes
- have no prime factors in common
- the "part" keywords
- is/are
- the "whole" keywords
- of
- percent formula
- part= percent x whole
- to increase a # by a percent
- add percent to 100, conver to decimal, and multiply
- finding the original whole
- ex. 25 percent increase over x is 1.25x.
- ratios
-
of
----
to - part to part ratios
- each # in original ratio over the sum of the #s
- average speed!
-
average speed= total distance / total time
v= d/t - mode
- value that appears most often
- probability
- favorable outcomes/ total possible outcomes
- inverse variations
-
xy=k
k is constant - distance formula
- d= square root (x1-x2)2 + (y1-y2)2
- midpoint formula
- (x1 + x2 / 2) , (y1 + y2 / 2)
- exterior angles of a triangle
- are equal to the sum of the remote interior angles
- the 3 exterior angles of a triangle add
- up to 360 degrees
- triangle inequality theorem
- the length of 1 side of a triangle must be greater than the difference and less than the sum of the other two sides
- 30-60-90 triangle
- x: x (radical 3) : 2x
- 45- 45- 90 triangle
- x: x: x(radical 2)
- interior angles of a polygon
-
sum of angles = (n-2) x 180
n is # of sides - circumference of cirlce
- C= 2 pie r
- area of circle
- pie r squared
- area of a sector of circle
- (n / 360) (pie r squared)
- surface area of rectangle solid
- SA= 2lw + 2wh + 2lh
- volume of recntagular solid
- V= lwh
- volume of cylinder
- v= (pie r squared) x h