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Math Glossary Letter D
d=rt
noun
Distance formula
data
noun
Characteristics or information, usually numerical, that are collected through observation.
date
noun
the day of the month or year as specified by a number
day
noun
A unit of time equal to 24 hours
debt
noun
money owed by one party to another party
noun
A unit of time equal to 24 hours
decagon
noun
10 sided polygon or 10-gon
decay
noun
Reduction in size from decomposition
deciliter
noun
A unit of liquid measurement
decimal
noun
Number in the form a/b where the result is not a whole number
decimal degrees
noun
express latitude and longitude geographic coordinates as decimal fractions
decimal place
noun
the position of a digit to the right of a decimal point.
declining balance depreciation
noun
depreciation method using a ratio of salvage to asset value as a factor
decompose
noun
break down a fraction into smaller parts
decompose fraction
noun
break apart a fraction where the numerators equal 1
deficient numbers
noun
A number (n) with the sum of proper factors less than n
degree
noun
A unit of angle measurement, or a unit of temperature measurement
degrees of freedom
noun
number of values in the final calculation of a statistic that are free to vary
delta
noun
A letter of the greek alphabet used for math notation.

Δ  δ
demand
noun
a consumer desire to purchase goods and services and willingness to pay a specific price for them
demoivres theorem
noun
A formula useful for finding powers and roots of complex numbers

z = rcis(θ), then zn = rncis(nθ)
denomination
noun
A currency unit
denominator
noun
The bottom portion of a fraction. For a/b, b is the denominator
density
noun
The compactness measure of an object
dependent variable
noun
A variable reliant on another variable
deposit
noun
a sum of money placed or kept in a bank account, usually to gain interest.
depreciation
noun
The reduction in value of an asset over time
derangement
noun
permutation with no fixed points

!n
derivative
noun
rate at which the value y of the function changes with respect to the change of the variable x
descartes rule
noun
determine the number of real zeros of a polynomial function
descending
verb
to arrange numbers in decreasing order, that is, from largest to smallest.
determinant
noun
value computed from a square matrix

det(A) or |A|
dewey decimal system
noun
proprietary library classification system
diagonal
noun
line segment that goes from one corner to another, but is not an edge
diagonal of a square
noun
line segment that goes from one corner of a square to another, but is not an edge
diagonals of a polygon
noun
line segment that goes from one corner of a polygon to another, but is not an edge
diameter
noun
distance from two endpoints of a circle through the center

d = 2r
diameter of a circle
noun
distance from two endpoints of a circle through the center

d = 2r
diameter of a cylinder
noun
distance from two endpoints of a cylinder through the center
diametrically opposed
noun
Two points on a circle or sphere at opposite ends of the diameter.
diametrically opposed
noun
Two points directly opposite each other on a circle or sphere
dice
noun
objects used in games of chance wih 6 sides
dices coefficient
noun
statistic used for comparing the similarity of two samples

|A ∩ B|/(|A| + |B|)
difference
noun
the result of one of the important mathematical operations, which is obtained by subtracting two numbers
difference of proportion
noun
hypothesis test to determine whether the hypothesized difference between population proportions differs significantly from the observed sample difference
difference of squares
noun
Binomial factoring formula

a2 - b2 = (a + b)(a - b)
digit
noun
Any of the numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) used to construct a number
digit problems
noun
math problems involving variables for each place value, h for hundreds, t for tens, and o for ones as an example
digit product
noun
Multiplying the digits of a number and repeating the process of the product until all digits have been multiplied together
digit sum
noun
Adding the digits of a number and repeating the process of the sum until the final sum is less than 10
digraph
noun
a combination of two letters representing one sound
dime
noun
currency unit worth 10 cents
dimension
noun
the number of rows by the number of columns for a matrix
diophantine
noun
equation in which only integer solutions are allowed
direct current
noun
Undirectional flow of an electric charge
direction
noun
the line or course on which something is going
directrix
noun
line in a parabola not through the focus
discount
noun
the amount by which the market price of a bond is lower than its principal amount due at maturity
discount rate
noun
the interest rate used in discounted cash flow (DCF) analysis to determine the present value of future cash flows. Key Takeaways.
discrete math
noun
Deals with math structures which is not continuous, rather discrete
discrete random variable
noun
a type of variable whose value depends upon the numerical outcomes of a certain random phenomenon
discriminant
noun
Shows how many roots and their properties a polynomial has

Δ
disjoint sets
noun
Sets with no common elements
disjunction
noun
a binary connective classically interpreted as a truth function the output of which is true if at least one of the input sentences (disjuncts) is true, and false otherwise
displacement
noun
Movement of an object from it's current position
distance
noun
interval between two points in time

d = rt
distance catch up
noun
word problems involving a staggered start between 2 people or objects to see when they meet
distance rate and time
noun
formula relating distance, rate, and time

d = rt
distribution
noun
value range for a variable
Distributive Property
noun
Property stating you can multiply a sum by multiplying each addend separately and then add the products

a(b + c) = ab + ac
divide
verb
To split into equal parts or groups

÷
dividend
noun
a reward paid to the shareholders for their investment in a company's equity
dividend discount model
noun
A formula used to value a stock based on the present value of dividends

P = D/(i - k) where i is the interest rate and k is the growth rate of dividends
dividing
verb
separate a number into parts
divisibility
noun
Determine factors (whole numbers) for a given number
division
noun
separate a number into parts
division equality
noun
f you divide one side of an equation by a number, you also must divide the other side by the same number so that your equation stays the same
Division Property of Inequality
noun
f you divide one side of an inequality by a number, you also must divide the other side by the same number so that your inequality stays the same
divisor
noun
a number by which another number is to be divided.
dollar
noun
Currency unit
dollar weighted interest method
noun
Evaluating a fund's interest based on the amount invested
domain
noun
Set of all possible input values which makes the output value of a function valid
dot product
noun
The sum of the products of corresponding components. Equivalently, it is the product of their magnitudes, times the cosine of the angle between them

a · b
double
noun
Multiply by 2
double declining balance depreciation
noun
depreciation method using a ratio of salvage to asset value as a factor. The asset loses value at twice the rate of the straight line depreciation method
double factorial
noun
Factorial method subtracting 2 from each successive number, instead of 1 like a standard factorial

n!!
doubling time
noun
the amount of time it takes for a given quantity to double in size or value at a constant growth rate
dozen
noun
Quanity of 12
drawing from a container
noun
Probability method of selecting objects from a container and computing the probability
duplication and mediation
noun
Algorithm to compute the product of two numbers, using even sub-products
duration
noun
the weighted average of the times until those fixed cash flows for a bond are received.