The sum of a number and twelve is 21 what is the number. Pls help fast!

Question

contestada

Respuesta :

keehndan keehndan · Answer 1 · 2022-04-14T18:29:17+02:00

Answer:

9

Step-by-step explanation:

In order to find what needs to be added, you can subtract the number your already have. In this case, subtract twelve from twenty-one.

21 - 12 = 9

To check, we can add nine to 12 and see if it works.

12 + 9 = 21 is correct.

So 9 is our answer.

Brainliest please?

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anuksha0456 anuksha0456 · Answer 2 · 2022-06-14T21:25:21+02:00

The number that makes the sum of 21 when added with 12 is 9. Found solving the linear equation x + 12 = 21. Hence, option B is the right choice.

Linear equations are relations between two expressions having their degree less than or equal to 1.

In the question, we are given that the sum of a number and 12 is 21.

We are asked to find the number.

We assume the number to be x.

∴ The sum of a number and 12 is expressed using the expression: x + 12

This expression is equal to 21, which can be represented by the linear equation: x + 12 = 21.

To find x, we solve this linear equation using the given steps:

Equation: x + 12 = 21

Subtract 12 from both sides of the equation: x + 12 - 12 = 21 - 12

∴ x = 9.

∴ The number that makes the sum of 21 when added with 12 is 9. Found solving the linear equation x + 12 = 21. Hence, option B is the right choice.

Learn more about linear equations at

https://brainly.com/question/1884491

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