Mometrix math

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74 Terms

1
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Prime

who numbers greater than 1 (odd)

2
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Composite

multiples of a number are not 1 (even aside from 2)

3
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is 1 prime or composite

neither

4
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match these words up: dividend, divsor, quotient

dividend/divisor=quotient

5
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direction of scientific notation negative

to the left

6
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direction of scientific notation positive

to the right

7
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How to find a percent of a cost

whole number x percent

8
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percent change in pay formula

(new pay - old pay) /old pay

9
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rational number

fraction

10
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irrational number

decimal or mixed number

11
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midpoint formula

12
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distance formula

13
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1 acre is how many sq yards

4840 sq yards

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transversal line

line that intersects 2 or more lines at distinct points

15
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concurrent lines

3 or more lines at a specific point

16
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perpendicular lines

forms right angle

17
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noncolliner points

points that aren’t 3 in a row

18
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congruent angle

always vertical

19
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supplementary angle

either of two angles whose sum is 180°.

20
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how many sides does a dodecagon have

12 sides

21
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interior angle of a regular decagon formula

(n-2) x 180 /10

22
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Concave Angle

  • A concave angle is greater than 180° but less than 360°.

  • It “caves in” if you imagine the shape bending inward.

23
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Convex Angle

  • A convex angle is less than 180°.

  • It “bulges outward” and is the type of angle you usually see in triangles and most polygons.

24
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are a of hexagon formula

A = ½ ap

perimeter to plug (12V3)

25
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find the amount of diagnols in dodecagon

n(n-3)/2

26
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line of symmetry

any line that goes straight through the middle

27
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Area of Triangle

A = 1/2 b h

28
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Circumcenter

point of concurrency of the perpendicular bisectors of the sides of a triangle

29
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Incenter

angle bisectors

30
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Centroid

medians

31
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Orthocenter

altitude

32
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obtuse angle

greater than 90 degrees

33
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scalene triangle

3 unequal sides

34
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isosceles triangle

two sides of equal length and the third side a different length

35
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Triangle equality therom

sum of two shorter sides must be greater than longest side

36
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ASA (Angle-Side-Angle)

Needs two angles and the side between them.

37
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SSA (Side-Side-Angle)

Two sides and a NON-included angle

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SAS (Side-Angle-Side)

Two sides and the INCLUDED angle

39
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Area of trapezoid

A = ½ (b1 + b2) h

40
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Perimeter of trapezoid

P=2(a+b)

a is the top

b is the side/height

41
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area of a circle

A=A = πr²

42
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circumfrence of a circle

C = πd

C = 2πr

43
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90 degrees moves where on a graph clockwise

right and down

44
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180 degrees moves

flips across origin

45
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45 degrees moves

diagnolly

46
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90 degrees counterclockwise moves

left and up

47
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reflection

mirror

48
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rotation

turn

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translation

slide

50
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dilation

resize

51
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volume of a sphere

V = 4/3 π r³

52
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surface area of a rectangular prism

prisim=2(wL+hL+hw)

53
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surface area of a cylinder

2πr² + 2πrh

54
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Volume of a pryramid

1/3(B)(H)

55
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prythagorean therom is what and what is it used for

to find a missing length of a triangle

a2 and b2 = legs c2= hypotenuse

a2+b2=c2

have to take the square root on both sides at the end to get rid of exponent

56
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how to find the slope of the line when given 15x-5y=20

isolate y and whatever x is left is m

y=mx+b

57
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watch a video on inequalities

58
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when solving and graphing inequalities what happens

divide by negative sign the sign gets switched

u must draw the arrow in the direction is is pointing in

you put a circle over the number

the circle is filled in if its greater than equal to sign and an open circle if just greater than

59
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elimination method of system of equations

requires you to have the same number to cross cancel and u will do that both for x and y

60
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Quadratic Formula

x=(-b sq root b²-4ac )/2a

61
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parabola that opens up and down

(x-h)

p>o opens up

p<o opens down

62
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parabola that opens left and right

(y-k)

p>o right

p<o left

63
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how to find range of function

plug in each number

64
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find domain of a fraction how

use denominator

65
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census

collection of data for the whole population.

66
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sample

collection of data for a part of the population.

67
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parameter

value calculated from a census

68
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statistic

is a value calculated from a sample

69
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Given that 25% of 200 is 50,

of means what

multiply

70
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5 is 10% of what number?

is means what

divide and the percentage is usually the divider

71
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A $250 stereo is discounted 18%. Find the new sale price.

1. Convert 18% to a decimal (divide by 100 or moving the decimal 2 places to the left) = 0.18 2. 0.18 X $250 = $45 3. Subtract the discounted amount from the original cost: $250 − $45 = $205

72
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A $230 camera is sold to a consumer who must pay 8.5% sales tax. Find the price with tax.

1. Convert 8.5% to a decimal (0.085) 11 2. 0.085 X $230 = $19.55 (this is the tax amount) 3. Add the tax to the original cost to find the total cost: $19.55 + $230 = $249.55

73
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My little brother grew from 60 to 66 inches in the last year. What percentage increase is this?

1. The amount of increase is 6 inches – this will be the numerator 2. The original height is 60 inches – this will be the denominator. 3. Change the fraction to a percentage. 6 60 = 0.1 X 100 = 10%. Therefore, the brother’s height increased by 10%

74
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12 > −2x

Add 2x to both sides. 2x + 12 > 0 Subtract 12 from both sides. 2x > −12 Divide both sides by 2. x > −6 An alternate approach is to change the inequality sign when you multiply or divide by a negative number. Here’s how that could be done, starting at the same step shown above. 12 > -2x Divide both sides by 2. 6 > -x Divide both sides by -1 and change the direction of the inequality sign