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You can:* Add the same expression to both sides of an equation * Subtract the same expression from both sides * Multiply the same expression (must not be zero) to both sides * Divide both sides by the same expression (must not be zero)
If ' A ' is a number, then that's one of them.The other number must be the same as the first number, becausetwo different numbers can't both be equal to the same number.So both of the two numbers that equal ' A ' must be the same number that ' A ' is.
I don’t know
Not always because a 2 by 12 rectangle will have the same area as a 4 by 6 rectangle but they both will have different perimeters.
No. For a percentage, both measurements must be expressed in the same units.