The sum of a number and 10 is -10
n+10=-10
n=-10-10
n=(-10)+(-10)
n=?
To solve this problem, we need to set up an equation. Let's call the unknown number "x".
The sum of a number and 10 can be written as "x + 10". According to the problem, this sum is equal to -10. So we can write the equation as:
x + 10 = -10
To solve for x, we can subtract 10 from both sides of the equation:
x + 10 - 10 = -10 - 10
Simplifying this equation gives us:
x = -20
Therefore, the number is -20.