Question

The sum of eleven and a number is negative nine.

Answer 1

Answer:

The sum is 2. ...........

Answer 2

Answer:

11 + x = -9

x = -20

Step-by-step explanation:

"The sum of eleven and a number" can be translated to: 11 + x, where 'x' is the unknown number.

$11 + x = -9\\\rule{150}{0.5}\\11 - 11 + x = -9 - 11\\\\\boxed{x = -20}$

Hope this helps.