Exam (elaborations)
SAT Math Test Question and Answers
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SAT Math Test Question and Answers
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SAT Mathquadratic formula - Answer -[-b ± √(b² - 4ac)] / (2a)
slope formula - Answer -(y₂- y₁) / (x₂- x₁)
integers - Answer -..., -3, -2, -1, 0, 1, 2, 3, ...
rationals - Answer -fractions (anything expessable as a ratio of integers)
reals - Answer -integers, rationals, plus special #s (like √2 or pi)
order of opperations - Answer -PEMDAS (Parentheses / Exponents / Multiply / Divide / Add / Subtract)
Arithmetic Sequences - Answer -t₁, t₁+ d, t₁+2d, ...
Geometric Sequences - Answer -t₁, t₁· r, t₁· r², ...
Factors - Answer -ex. factors of 52 are 2, 4, 13, and 26
Multiples - Answer -ex. multiples of 20 are 40, 60, 80, 100, ...
, percentages - Answer -part = (percent / 100) x whole
average - Answer -average = sum of terms / number of terms
average speed - Answer -average speed = total distance / total time
sum - Answer -sum = average x (number of terms)
mode - Answer -mode = value in the list that appears most often
median - Answer -median = middle value in the list
fundamental counting principle - Answer -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.
probability - Answer -probability = number of desired outcomes / number of total outcomes
adding exponents - Answer -x^a · x^b = x^(a+b)
subtracting exponents - Answer -x^a / x^b = x^(a-b)
negative exponents - Answer -1 / x^b = x^(-b)
multiplying exponents - Answer -(x^a)^b = x^(a·b)
x^0 - Answer -1
roots - Answer -√(xy) = √x · √y
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