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A number is a multiple of 7 if and only if it can be divided by 7 with no remainder.
The conditional statement is: "If 2x - 5 = 11, then x = 8" The biconditional statement is the statement that contains "if and only if". Some textbooks or mathematicians use this symbol ⇔. The biconditional statement of the given is: x = 8 ⇔ 2x - 5 = 11 OR x = 8 if and only if 2x - 5 = 11.
An integer n is odd if and only if n^2 is odd.
A number that can be divided by another number without a remainder.
There is no agreed definition but the following, from the Encyclopedia Britannica is a good one. It defines mathematics asThe science of structure, order, and relation that has evolved from elemental practices of counting, measuring, and describing the shapes of objects.