Ace the Test
quadratic 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)