Q: What does two equal signs and a d mean?

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Two intervals (a, b) and (c, d) are said to be equal if b - a = d - c.

=D is a cheesy grin :)

Assuming you mean the Roman letter D used to represent a number: D = 500

"the same as the others added together" For example: a=b+c+d a is equal to the sum of b plus c plus d. 9=2+3+4

The four possible combinations are:A = (+, +)B = (+, -)C = (-, +) andD = (-, -)In A and D, the two numbers have the same signs and the multiplication gives a positive answer.In B and C, the two numbers have different signs and the multiplication gives a negative answer.

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Two intervals (a, b) and (c, d) are said to be equal if b - a = d - c.

=D is a cheesy grin :)

The ratios a/b and c/d [ or a:b and c:d ] are equal if (and only if) a*d = b*c

Assuming you mean the Roman letter D used to represent a number: D = 500

I assume you mean (+/-)batzelladine D. The signs refer to the direction which each enantiomer rotates plane polarized light.

The cross product must be equal. Two fractions: A/B and C/D are equal if (and only if) A*D = B*C

Generally, the sharp and flat signs are known as accidentals. They alter the pitch of the note. As an example, D sharp is a half-step higher than D where D flat is a half step lower.

Yes. D = 2R

The two letters that mean to rot are "D" and "E".

It is A to bisect is to cut into two equal parts

They have 2 different hand signs they do a Lower case d and capital T.

"the same as the others added together" For example: a=b+c+d a is equal to the sum of b plus c plus d. 9=2+3+4