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Prime number
A number that is only evenly divisible by two distinct values, one and the number itself
Example: 1 is not this bc it has one factor, 2 is this
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Which number is in the ones place in 67.98
7 is the ones place
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Which number is in the tens place 67.98
6 is in the tens place
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Which number is in the tenths place 67.98
9 is in the tenths place
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Which number is in the hundredths place 67.98
8 is in the hundredths place
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Percent change formula
New value - old value / Old value
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x^a
______ = ?
x^b
X^(a-b)
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Linear equation: Standard form
Ax + By = C
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Linear equation: slope-intercept form
y = mx + b
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Linear equation: point-slope form
(y - y1) = m(x - x1)
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Slope, m - rise over run
m = y2 - y1 / x2 - x1
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Simple Interest formula
I = p • r • t
- I = total interest
- p = initial amount
- r = interest rate (decimal form)
- t = # of years
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Compound Interest formula
A = p( 1 + r/n )^n•t
- A = future value
- p = initial amount
- r = interest rate as a decimal
- n = # of times the interest is compounded per yr
- t = # of years
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Polygon
The combination of 3 or more lines to form a closed figure
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Formula for calculating the sum of the interior angles of a polygon, where n is the # of sides
(n - 2) • 180 deg
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Area of a triangle
A = 1/2bh
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Congruent figure means
Same shape and same size
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Similar figure mean
Same shape but not same size
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Area of a trapezoid
A = 1/2 (b1 + b2)(h)
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Area for squares, rectangles, and parallelograms
A = bh
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Circumference formula
2 • pie • r
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Area of a circle
A = pie • r^2
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Volume
Amount of space enclosed in a 3D figure
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Volume of rectangular prism
V = lwh
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Surface area of rectangular prism definition and formula
The sum of the areas of each face
A = 2(lw + lh + wh)
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Volume of circular cylinder
V = πr^2h
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Surface area of circular cylinder
A = 2πrh + 2πr^2
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Negative slope
Goes down from left to right
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Positive slope
Goes up left to right
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Distance rate time formula
D = rt
- D: Distance
- R: rate
- T: time
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Distance formula
D = square root sign over (x2-x1)^2 + (y2-y1)^2
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