Formulas Flashcards
(23 cards)
to find the percentage of a number (not a decimal!)
part/whole x 100
Motion:
D = RT
Work:
A = RT (Amount = work Rate * Time)
Area of a square
A = s^2 (^=squared notation)
Area of a triangle
A = 1/2*b/h
Area of a rectangle
A = b*h
Area of a trapazoid
A = b1+b2/2*h
circumference of a circle
C = 23.14r
area of a circle
A = 3.14*r^2
Volume of a cube
V = s^3
volume of a rectangle
V = hwd
volume of a cylinder
V = 3.14r^2*h
Slope intercept form
Y = mx+b
y = mx+b
- B is the y intercept.
- M is the slope. So create any two points, (one being on the y intercept), and find the slope/difference between the two.
- Solve equation.
Finding the slope
slope = rise/run
OR
slope = y2-y1/x2-x1
Rise - y intercept
Run - x intercept
Divide.
definition of mean (average):
(sum of terms)/(the number of terms)
definition of range:
(max value) – (min value)
expected number of successes (probability)
(probability)*(number of trials)
0 ≤ P ≤ 1
P = 0 means an event is impossible, guaranteed not to happen
P = 1 means an event is certain, guaranteed to happen
Volume of a pyramid
V = lwh/3
definition of mode
the number that appears most often in a set
Finding slope with equation
- Formula looks like 8x + 5y = 17
- Run over rise. (Negative sign) - 8/5.
Finding percentage of a number
Is/of = %/100.
1. Fill in info you have
2. Cross multiply
3. Divide by 100.
Finding the percentage of a number
To calculate 20% of 30, first convert the percentage to a decimal by dividing it by 100, which gives 0.20. Then, multiply this decimal by 30.
