Answer: 11x−5.
Explanation:
The number:
x
The sum of 3 times the number and -5:
3x−5
Added to 8 times the number:
3x−5+8x
Now, we can simplify this expression:
3x−5+8x=11x−5
So, the expression "The sum of 3 times a number and -5, added to 8 times the number" simplifies to: 11x−5.