Four times the sum of a number and fifteen

Answer 1

To express "four times the sum of a number and fifteen" mathematically, we first need to define our variable. Let's use \( x \) to represent the unknown number.

The phrase "the sum of a number and fifteen" can be written as \( x + 15 \).

Now, "four times the sum of a number and fifteen" can be expressed as:

\[ 4(x + 15) \]

This represents the complete expression. If you have further operations or calculations in mind (like simplifying or solving), feel free to let me know!