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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.