Answer: second option.
Step-by-step explanation:
Let be "x" the unknown number.
According to the information provided in the exercise, 10 is the result of the subtraction of "x" and -5.
Based on this, you can write the following equation:
\(x-(-5)=10\)
To find the value of "x" you must remember the multiplication of signs:
\((+)(+)=+\\(-)(-)=+\\(-)(+)=-\)
Then:
\(x-(-5)=10\\\\x+5=10\)
Finally, subtracting 5 from both sides of the equation, you get:
\(x+5-(5)=10-(5)\\\\x=5\)
