4 years ago

What do you suppose is true about a sum added to its opposite?

1 answer:

6 0

Opposite number, also called the additive inverse, is by defition a number that if you add it to its opposite, the result will be 0!!!

so you know that a number added to its opposite will be 0!

in practice this means that it's the same value with the opposite sign.

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I am a 2 digit number the sum of my digits is 12. the ones digit is twice the tens digit? who am i?

Bas_tet [7]

Answer:

Step-by-step explanation:

let a be the 1's digit and b the 10's digit, then

a = 2b ← twice the 10's digit, thus

sum = 2b + b = 12, that is

3b = 12 ( divide both sides by 3 )

b = 4

and a = 2b = 2 × 4 = 8

The 2 digit number is 84