Algebra
2x - 4y = 9
x = 9 / 2
What is a Linear Pair
A pair of adjacent angles whose noncommon sides are opposite rays.
What is sin 30°
1/2
validity
the extent to which evidence supports the intended inferences and uses of test scores
Second Derivative Test
if f'(c) = 0 and f''(c) > 0 then minimum; if f'(c) = 0 and f''(c) < 0 then maximum
f(x) = 6x + 1
f(2) - f(1) = (6*2 + 1) - (6*1 + 1) = 6
What are Supplementary angles
Two angles whose sum is 180 degrees
sin (2x) =
2 sin x cos x
Common Shapes of Distributions
Symmetric
Skewed to the right
Skewed to the left
Bell-shaped
l'Hospital's Rule
lim f(x)/g(x) = lim f'(x)/g'(x)
|-2x + 2| -3 = -3
x = 1
What are Vertical Angles
A pair of opposite congruent angles formed by intersecting lines
cos² x =
(1 + cos(2x) )/2
Describe the standard deviation
Gives a rough estimate of the typical distance of a data value from the mean
Relationship between a, b, c for ellipse
a² = b² + c²