Math Lessons starting with the letter D

[+] d-i-v interest rate relationships [+] Date and Time Difference

Free Date and Time Difference Calculator - Calculates the difference between two dates using the following methods
1) Difference in dates using year/month/day/hour/minute/second as the primary unit of time
2) Difference in dates in the form of years remaining, months remaining, days remaining, hours remaining, minutes remaining, seconds remaining.
Features: Calculator | Practice Problem Generator
Examples (1):
1/5/1950 and 7/20/2011
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[+] Date Calendar [+] Date Information

Free Date Information Calculator - This calculator takes a date in mm/dd/yyyy format, and gives the following information about it:
* Weekday
* Day number in the year
* Week number in the year
* Number of days in the month containing that date
* Leap Year (Yes or No)
* Zodiac Sign
* Julian Date
Features: Calculator | Practice Problem Generator
Examples (2):
4/15/1978
10/30/2001
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[+] Day of Year Calendar [+] Decagon [+] Decagonal Number [+] Decay [+] Decimal Degree Minutes Seconds [+] Declining Balance Depreciation [+] Decompose Fraction [+] Decompose Number Pairs [+] Demoivres Theorem

Free Demoivres Theorem Calculator - Using Demoivres Theorem, this calculator performs the following:
1) Evaluates (acis(θ))ⁿ
2) Converts a + bi into Polar form
3) Converts Polar form to Rectangular (Standard) Form
Features: Calculator
Examples (2):
2cis60^3
4-7i
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[+] DeMorgans Laws [+] Density

Free Density Calculator - Solves for any of the 3 items in the Density Formula, Density (D), Mass (M), and Volume (V) (Capacity), with 2 given items.
Features: Calculator | Quiz Generator | Practice Problem Generator
Examples (6):
d=200,m=10
d=50,v=5
m=20,v=10
density = 100,mass=25
density=50,volume=10
mass=20,volume =5
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[+] Derangements - Subfactorials [+] Derivatives

Free Derivatives Calculator - This lesson walks you through the derivative definition, rules, and examples including the power rule, derivative of a constant, chain rule
Features: Calculator | Practice Problem Generator
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[+] Dewey Decimal System Classification [+] Difference of Proportions Test [+] Difference of Two Squares

Free Difference of Two Squares Calculator - Factors a difference of squares binomial in the form a² - b² or multiplies 2 binomials through in the form (ax + by)(ax - by).
Features: Calculator | Practice Problem Generator
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[+] Digit Problems

Free Digit Problems Calculator - Determines how many (n) digit numbers can be formed based on a variety of criteria.
Features: Calculator | Watch the Video
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[+] Digit Product [+] Digit Sum [+] Digraph Items

Free Digraph Items Calculator - Given a digraph, this determines the leader, and symmetric matrix.
Features: Calculator
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[+] Diophantine Equations [+] Direct Current (Electrical Engineering) Ohms Law

Free Direct Current (Electrical Engineering) Ohms Law Calculator - Enter two of the following items from the DIRECT CURRENT(DC) electrical engineering set of variables, and this will solve for the remaining two:
* I = current(amps.)
* V = Electricity potential of voltage(volts)
* R = resistance(ohms)
* P = power(watts)
Features: Calculator | Practice Problem Generator
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[+] Distance Catch Up

Free Distance Catch Up Calculator - Calculates the amount of time that it takes for a person traveling at one speed to catch a person traveling at another speed when one person leaves at a later time.
Features: Calculator | Practice Problem Generator
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[+] Distance Rate and Time [+] Distributive Property [+] Dividend Discount Model [+] Divisibility [+] Division Equality Property [+] Division Property Of Inequality [+] Dollar Weighted Interest Method

Free Dollar Weighted Interest Method Calculator - Solves for Interest Rate, Starting Asset Value, Ending Asset Value, and Expenses using the Dollar Weighted Method.
Features: Calculator
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[+] Double Declining Balance Depreciation [+] DoubleClick Search Fundamentals