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SAT Math
1.quadratic formula: [-b ±(b² - 4ac)] / (2a)
2.slope formula: (y‚- y•) / (x‚- x•)
3. integers: ..., -3, -2, -1, 0, 1, 2, 3, ...
4.rationals: fractions (anything expessable as a ratio of integers)
5.reals: integers, rationals, plus special #s (like2 or pi)
6.order of opperations: PEMDAS (Parentheses / Exponents / Multiply /
Divide / Add / Subtract)
7.Arithmetic Sequences: t•, t•+ d, t•+2d, ...
8.Geometric Sequences: t•, t•· r, t•· r², ...
9.Factors: ex. factors of 52 are 2, 4, 13, and 26
10.Multiples: ex. multiples of 20 are 40, 60, 80, 100, ... 1 / 2
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11.percentages: part = (percent / 100) x whole
12.average: average = sum of terms / number of terms
13.average speed: average speed = total distance / total time
14.sum: sum = average x (number of terms)
15.mode: mode = value in the list that appears most often
16.median: median = middle value in the list
17.fundamental counting principle: if an event can happen in N ways,
and another, independent event can happen in M ways, then both events together can happen in N x M ways.
18.probability: probability = number of desired outcomes / number of
total out- comes
19.adding exponents: x^a · x^b = x^(a+b)
20.subtracting exponents: x^a / x^b = x^(a-b)
21.negative exponents: 1 / x^b = x^(-b)
22.multiplying exponents: (x^a)^b = x^(a·b)
23. x^0: 1
24. roots:(xy) =x ·y
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